:root {
  --font: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --serif: Iowan Old Style, Baskerville, Georgia, serif;
  --radius-sm: 12px;
  --radius: 18px;
  --radius-lg: 28px;
  --shadow-sm: 0 1px 2px rgba(89, 40, 60, .05), 0 8px 24px rgba(102, 42, 67, .05);
  --shadow: 0 22px 70px rgba(105, 42, 69, .12);
  --transition: 180ms ease;
}

html[data-theme="pink"] {
  color-scheme: light;
  --bg: #fffafd;
  --bg-soft: #fff4f8;
  --surface: rgba(255, 255, 255, .88);
  --surface-solid: #fff;
  --surface-2: #fff4f8;
  --surface-3: #fce9f0;
  --text: #35252d;
  --muted: #88747d;
  --faint: #b09da5;
  --border: #eedde4;
  --border-strong: #e3cbd5;
  --primary: #dc638f;
  --primary-hover: #c94f7c;
  --primary-soft: #ffe5ef;
  --primary-ink: #8f3158;
  --focus: #e783a8;
  --danger: #c84861;
  --danger-soft: #fff0f2;
  --success: #4a9177;
  --topbar: rgba(255, 250, 253, .86);
  --card-face: #fff;
}

html[data-theme="purple"], html[data-theme="blue"], html[data-theme="green"],
html[data-theme="berry"], html[data-theme="grey"] {
  color-scheme: dark;
  --surface: rgba(31, 27, 42, .9);
  --surface-solid: #211d2c;
  --surface-2: #2a2536;
  --surface-3: #342e42;
  --text: #f8f3fa;
  --muted: #b9afc2;
  --faint: #887f91;
  --border: rgba(255, 255, 255, .1);
  --border-strong: rgba(255, 255, 255, .17);
  --danger: #ff8395;
  --danger-soft: rgba(197, 54, 81, .15);
  --success: #80c8aa;
  --card-face: #262030;
  --shadow-sm: 0 12px 30px rgba(0, 0, 0, .18);
  --shadow: 0 26px 80px rgba(0, 0, 0, .34);
}

html[data-theme="purple"] { --bg: #16121f; --bg-soft: #1d1729; --primary: #b58ae8; --primary-hover: #c89df6; --primary-soft: rgba(178, 130, 231, .16); --primary-ink: #d7b9f6; --focus: #b58ae8; --topbar: rgba(22, 18, 31, .86); }
html[data-theme="blue"] { --bg: #0f1822; --bg-soft: #142231; --surface: rgba(23, 35, 48, .9); --surface-solid: #172330; --surface-2: #1d2c3b; --surface-3: #26394a; --primary: #69aee8; --primary-hover: #86c1f2; --primary-soft: rgba(86, 161, 221, .16); --primary-ink: #a8d6f7; --focus: #69aee8; --topbar: rgba(15, 24, 34, .86); --card-face: #192736; }
html[data-theme="green"] { --bg: #101b18; --bg-soft: #162622; --surface: rgba(24, 39, 35, .9); --surface-solid: #192823; --surface-2: #20332d; --surface-3: #294139; --primary: #6ebd99; --primary-hover: #88cfaf; --primary-soft: rgba(94, 183, 143, .16); --primary-ink: #a8e0c7; --focus: #6ebd99; --topbar: rgba(16, 27, 24, .86); --card-face: #1a2b26; }
html[data-theme="berry"] { --bg: #211017; --bg-soft: #2d151f; --surface: rgba(47, 23, 33, .9); --surface-solid: #311923; --surface-2: #3d1f2c; --surface-3: #4c2937; --primary: #e2769e; --primary-hover: #ef8db0; --primary-soft: rgba(226, 97, 145, .17); --primary-ink: #f7b2cc; --focus: #e2769e; --topbar: rgba(33, 16, 23, .86); --card-face: #351b26; }
html[data-theme="grey"] { --bg: #161819; --bg-soft: #202324; --surface: rgba(36, 39, 40, .9); --surface-solid: #252829; --surface-2: #2e3233; --surface-3: #3a3e40; --primary: #aeb7ba; --primary-hover: #c1c9cb; --primary-soft: rgba(174, 183, 186, .14); --primary-ink: #d7dddf; --focus: #aeb7ba; --topbar: rgba(22, 24, 25, .86); --card-face: #282c2d; }

* { box-sizing: border-box; }
html { min-height: 100%; background: var(--bg); }
body { margin: 0; min-width: 320px; min-height: 100vh; color: var(--text); background: var(--bg); font-family: var(--font); font-size: 15px; line-height: 1.5; -webkit-font-smoothing: antialiased; }
button, input, textarea { font: inherit; }
button { color: inherit; }
button, summary, a { -webkit-tap-highlight-color: transparent; }
button:focus-visible, input:focus-visible, textarea:focus-visible, summary:focus-visible { outline: 3px solid color-mix(in srgb, var(--focus) 35%, transparent); outline-offset: 2px; }
::selection { color: var(--text); background: var(--primary-soft); }
.hidden { display: none !important; }
.ambient { position: fixed; z-index: -1; width: 420px; height: 420px; border-radius: 50%; opacity: .32; filter: blur(90px); pointer-events: none; }
.ambient-one { top: -210px; right: -140px; background: var(--primary-soft); }
.ambient-two { bottom: -260px; left: -180px; background: color-mix(in srgb, var(--primary) 18%, transparent); }

.brand { display: inline-flex; align-items: center; gap: 11px; color: var(--text); font-size: 21px; font-weight: 750; letter-spacing: -.7px; text-decoration: none; }
.brand-mark { position: relative; display: inline-grid; width: 31px; height: 31px; place-items: center; }
.brand-mark::before, .brand-mark::after, .brand-mark span::before, .brand-mark span::after { position: absolute; width: 13px; height: 18px; border-radius: 60% 60% 52% 52%; content: ""; background: var(--primary); transform-origin: 50% 100%; }
.brand-mark::before { transform: translate(-6px, -5px) rotate(-48deg); }
.brand-mark::after { transform: translate(6px, -5px) rotate(48deg); }
.brand-mark span::before { transform: translate(-7px, 5px) rotate(-120deg); }
.brand-mark span::after { transform: translate(7px, 5px) rotate(120deg); }
.brand-mark span { z-index: 1; width: 10px; height: 10px; border: 3px solid var(--surface-solid); border-radius: 50%; background: #f6ce6a; }
.brand-mark-large { transform: scale(1.35); }
.brand-button { border: 0; background: none; cursor: pointer; }

.boot-screen { display: grid; min-height: 100vh; place-content: center; justify-items: center; gap: 18px; color: var(--muted); }
.boot-screen .brand-mark { animation: bloom 1.1s ease-in-out infinite alternate; }
@keyframes bloom { to { transform: scale(1.15) rotate(8deg); } }

.eyebrow { display: inline-flex; align-items: center; gap: 9px; color: var(--primary-ink); font-size: 12px; font-weight: 780; letter-spacing: .13em; text-transform: uppercase; }
.eyebrow-dot { width: 8px; height: 8px; border: 2px solid var(--primary); border-radius: 50%; box-shadow: 0 0 0 4px var(--primary-soft); }

.mini-bloom { display: inline-grid; width: 44px; height: 44px; margin-bottom: 13px; place-items: center; color: var(--primary); border-radius: 50%; background: var(--primary-soft); font-size: 22px; }
.field { display: grid; gap: 7px; }
.field > span, .accent-picker legend { color: var(--text); font-size: 12px; font-weight: 740; }
.field small { color: var(--faint); font-weight: 500; }
input, textarea { width: 100%; border: 1px solid var(--border); border-radius: var(--radius-sm); color: var(--text); background: var(--surface-solid); transition: border var(--transition), box-shadow var(--transition); }
input { height: 48px; padding: 0 14px; }
textarea { min-height: 96px; padding: 12px 14px; line-height: 1.55; resize: vertical; }
input::placeholder, textarea::placeholder { color: var(--faint); }
input:focus, textarea:focus { border-color: var(--focus); box-shadow: 0 0 0 4px color-mix(in srgb, var(--focus) 12%, transparent); outline: none; }
input:disabled { opacity: .65; cursor: not-allowed; }

.button { display: inline-flex; min-height: 44px; padding: 0 17px; align-items: center; justify-content: center; gap: 8px; border: 1px solid transparent; border-radius: 12px; font-size: 13px; font-weight: 750; cursor: pointer; transition: transform var(--transition), border var(--transition), background var(--transition), opacity var(--transition); }
.button:hover { transform: translateY(-1px); }
.button:active { transform: translateY(0); }
.button:disabled { opacity: .55; cursor: wait; transform: none; }
.button-primary { color: #fff; background: var(--primary); box-shadow: 0 8px 22px color-mix(in srgb, var(--primary) 24%, transparent); }
.button-primary:hover { background: var(--primary-hover); }
.button-secondary { color: var(--primary-ink); border-color: color-mix(in srgb, var(--primary) 30%, var(--border)); background: var(--primary-soft); }
.button-ghost { color: var(--muted); border-color: var(--border); background: var(--surface-solid); }
.button-danger { color: #fff; background: var(--danger); }
.button-wide { width: 100%; min-height: 50px; margin-top: 2px; justify-content: space-between; padding: 0 20px; }

.app-shell { min-height: 100vh; }
.topbar { position: sticky; z-index: 20; top: 0; display: grid; height: 76px; padding: 0 clamp(20px, 4.5vw, 74px); align-items: center; border-bottom: 1px solid var(--border); grid-template-columns: 1fr minmax(240px, 440px) 1fr; background: var(--topbar); backdrop-filter: blur(20px); }
.global-search { display: flex; height: 42px; padding: 0 11px; align-items: center; gap: 9px; border: 1px solid var(--border); border-radius: 12px; background: var(--surface-solid); }
.global-search svg { width: 17px; fill: none; stroke: var(--faint); stroke-linecap: round; stroke-width: 1.8; }
.global-search input { height: auto; padding: 0; border: 0; background: transparent; box-shadow: none; }
.global-search input:focus { box-shadow: none; }
kbd { padding: 1px 6px; color: var(--faint); border: 1px solid var(--border); border-radius: 5px; background: var(--surface-2); font-family: inherit; font-size: 11px; }
.top-actions { display: flex; align-items: center; justify-content: flex-end; gap: 12px; }
.icon-button { display: inline-grid; width: 40px; height: 40px; padding: 0; place-items: center; border: 1px solid var(--border); border-radius: 11px; color: var(--muted); background: var(--surface-solid); cursor: pointer; list-style: none; font-size: 22px; }
.icon-button::-webkit-details-marker { display: none; }
.theme-menu { position: relative; }
.theme-orb { width: 17px; height: 17px; border: 4px solid var(--primary-soft); border-radius: 50%; background: var(--primary); box-shadow: 0 0 0 1px var(--primary); }
.theme-popover { position: absolute; top: calc(100% + 12px); right: 0; width: 225px; padding: 14px; border: 1px solid var(--border); border-radius: 16px; background: var(--surface-solid); box-shadow: var(--shadow); }
.theme-popover > p { margin: 2px 5px 9px; color: var(--muted); font-size: 11px; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; }
.theme-options { display: grid; gap: 3px; }
.theme-options button { display: grid; padding: 9px; align-items: center; border: 0; border-radius: 10px; grid-template-columns: 24px 1fr 16px; gap: 8px; color: var(--text); background: transparent; text-align: left; cursor: pointer; }
.theme-options button:hover { background: var(--surface-2); }
.theme-options button b { visibility: hidden; color: var(--primary); }
.theme-options button.active b { visibility: visible; }
.swatch { width: 20px; height: 20px; border: 3px solid rgba(255,255,255,.55); border-radius: 50%; box-shadow: 0 0 0 1px rgba(65,45,54,.18); }
.swatch-pink { background: #ef7ba3; } .swatch-purple { background: #8c63bd; } .swatch-blue { background: #4689bd; } .swatch-green { background: #4a9473; } .swatch-berry { background: #b64b74; } .swatch-grey { background: #737d80; }
.avatar-button { display: flex; padding: 3px 5px 3px 3px; align-items: center; gap: 9px; border: 0; border-radius: 13px; background: transparent; cursor: pointer; }
.avatar-button:hover { background: var(--surface-2); }
.avatar-button > span:first-child { display: grid; width: 38px; height: 38px; place-items: center; border: 1px solid color-mix(in srgb, var(--primary) 25%, transparent); border-radius: 11px; color: var(--primary-ink); background: var(--primary-soft); font-family: var(--serif); font-weight: 700; }
.avatar-copy { display: grid; min-width: 80px; text-align: left; }
.avatar-copy b { overflow: hidden; max-width: 120px; font-size: 12px; text-overflow: ellipsis; white-space: nowrap; }
.avatar-copy small { color: var(--faint); font-size: 10px; }

.view { min-height: calc(100vh - 76px); }
.content-wrap { width: min(100% - 40px, 1180px); margin: 0 auto; padding: 63px 0 90px; }
.content-wrap.narrow { width: min(100% - 40px, 980px); }
.welcome-row { display: flex; align-items: end; justify-content: space-between; gap: 30px; }
.welcome-row h1 { margin: 13px 0 4px; font-family: var(--serif); font-size: clamp(37px, 4vw, 53px); font-weight: 500; letter-spacing: -.045em; line-height: 1.05; }
.welcome-row > div > p { margin: 0; color: var(--muted); }
.stat-grid { display: grid; margin: 43px 0 55px; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.stat-card { position: relative; display: grid; min-height: 116px; padding: 20px; overflow: hidden; align-items: center; border: 1px solid var(--border); border-radius: var(--radius); grid-template-columns: 48px 1fr; gap: 13px; background: var(--surface); box-shadow: var(--shadow-sm); }
.stat-card::after { position: absolute; right: -22px; bottom: -26px; width: 83px; height: 83px; border-radius: 50%; content: ""; background: var(--stat-soft); }
.stat-icon { display: grid; width: 45px; height: 45px; place-items: center; color: var(--stat); border-radius: 14px; background: var(--stat-soft); font-size: 22px; }
.stat-card > div { display: grid; }
.stat-card strong { font-family: var(--serif); font-size: 27px; line-height: 1; }
.stat-card span:not(.stat-icon) { margin-top: 5px; color: var(--muted); font-size: 11px; font-weight: 750; text-transform: uppercase; letter-spacing: .06em; }
.stat-card > small { position: absolute; top: 19px; right: 16px; color: var(--faint); font-size: 9px; }
.stat-rose { --stat: #c95f88; --stat-soft: rgba(232, 121, 161, .13); }
.stat-peach { --stat: #c77954; --stat-soft: rgba(236, 158, 111, .13); }
.stat-lilac { --stat: #896bb3; --stat-soft: rgba(150, 119, 190, .13); }
.stat-mint { --stat: #4d9378; --stat-soft: rgba(91, 170, 138, .13); }
.section-heading { display: flex; margin-bottom: 21px; align-items: end; justify-content: space-between; gap: 20px; }
.section-kicker { display: block; margin-bottom: 4px; color: var(--primary); font-size: 10px; font-weight: 820; letter-spacing: .13em; }
.section-heading h2, .modal h2 { margin: 0; font-family: var(--serif); font-size: 29px; font-weight: 600; letter-spacing: -.03em; }
.soft-pill { padding: 6px 11px; border: 1px solid var(--border); border-radius: 999px; color: var(--muted); background: var(--surface); font-size: 11px; font-weight: 700; }
.deck-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 17px; }
.deck-card { position: relative; min-height: 236px; padding: 0; overflow: hidden; border: 1px solid var(--border); border-radius: 21px; background: var(--surface-solid); box-shadow: var(--shadow-sm); cursor: pointer; transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition); }
.deck-card:hover { border-color: color-mix(in srgb, var(--deck-accent) 45%, var(--border)); box-shadow: var(--shadow); transform: translateY(-3px); }
.deck-cover { position: relative; height: 88px; overflow: hidden; background: linear-gradient(135deg, color-mix(in srgb, var(--deck-accent) 25%, var(--surface-solid)), color-mix(in srgb, var(--deck-accent) 8%, var(--surface-solid))); }
.deck-cover::before, .deck-cover::after { pointer-events: none; position: absolute; width: 95px; height: 95px; border: 17px solid color-mix(in srgb, var(--deck-accent) 22%, transparent); border-radius: 50%; content: ""; }
.deck-cover::before { top: -60px; right: 20px; }
.deck-cover::after { right: -45px; bottom: -65px; }
.deck-bloom { position: absolute; top: 18px; left: 22px; color: var(--deck-accent); font-size: 27px; }
.deck-body { padding: 19px 20px 18px; }
.deck-body h3 { overflow: hidden; margin: 0 34px 5px 0; font-family: var(--serif); font-size: 21px; font-weight: 620; text-overflow: ellipsis; white-space: nowrap; }
.deck-body > p { display: -webkit-box; min-height: 40px; margin: 0; overflow: hidden; color: var(--muted); font-size: 12px; -webkit-box-orient: vertical; -webkit-line-clamp: 2; }
.deck-meta { display: flex; margin-top: 17px; align-items: center; justify-content: space-between; color: var(--faint); font-size: 11px; }
.deck-meta span:first-child { color: var(--primary-ink); font-weight: 700; }
.deck-progress { height: 4px; margin-top: 11px; overflow: hidden; border-radius: 99px; background: var(--surface-3); }
.deck-progress progress, .study-progress progress { display: block; width: 100%; height: 100%; overflow: hidden; border: 0; border-radius: inherit; appearance: none; background: transparent; }
.deck-progress progress::-webkit-progress-bar, .study-progress progress::-webkit-progress-bar { border-radius: inherit; background: transparent; }
.deck-progress progress::-webkit-progress-value { border-radius: inherit; background: var(--deck-accent); }
.deck-progress progress::-moz-progress-bar { border-radius: inherit; background: var(--deck-accent); }
.deck-study { position: absolute; right: 15px; bottom: 17px; display: grid; width: 36px; height: 36px; place-items: center; border: 0; border-radius: 11px; color: var(--primary-ink); background: var(--primary-soft); font-size: 17px; cursor: pointer; }
.accent-rose { --deck-accent: #df7099; } .accent-peach { --deck-accent: #dd9368; } .accent-lilac { --deck-accent: #9272ba; } .accent-sky { --deck-accent: #659ecc; } .accent-mint { --deck-accent: #5d9f83; } .accent-berry { --deck-accent: #b64f78; }
.empty-state { padding: 60px 24px; border: 1px dashed var(--border-strong); border-radius: var(--radius-lg); background: color-mix(in srgb, var(--surface) 70%, transparent); text-align: center; }
.empty-state.compact { padding: 40px 24px; }
.empty-flower { display: inline-grid; width: 56px; height: 56px; place-items: center; color: var(--primary); border-radius: 18px; background: var(--primary-soft); font-size: 27px; }
.empty-state h3 { margin: 16px 0 5px; font-family: var(--serif); font-size: 24px; }
.empty-state p { max-width: 390px; margin: 0 auto 20px; color: var(--muted); }

.back-button { display: inline-flex; margin: 0 0 30px; padding: 5px 0; align-items: center; gap: 8px; border: 0; color: var(--muted); background: none; font-weight: 700; cursor: pointer; }
.back-button:hover { color: var(--primary); }
.deck-hero { position: relative; display: grid; min-height: 230px; margin-bottom: 44px; padding: 39px; overflow: hidden; border: 1px solid var(--border); border-radius: var(--radius-lg); grid-template-columns: 1fr auto; gap: 30px; background: linear-gradient(145deg, color-mix(in srgb, var(--deck-accent) 16%, var(--surface-solid)), var(--surface-solid)); box-shadow: var(--shadow-sm); }
.deck-hero::after { position: absolute; right: -80px; bottom: -140px; width: 310px; height: 310px; border: 50px solid color-mix(in srgb, var(--deck-accent) 10%, transparent); border-radius: 50%; content: ""; }
.deck-hero-copy { position: relative; z-index: 1; align-self: center; }
.deck-hero-copy .section-kicker { color: var(--deck-accent); }
.deck-hero h1 { margin: 5px 0 9px; font-family: var(--serif); font-size: clamp(34px, 5vw, 50px); font-weight: 560; letter-spacing: -.045em; line-height: 1.05; }
.deck-hero p { max-width: 610px; margin: 0; color: var(--muted); }
.hero-stats { display: flex; margin-top: 22px; gap: 10px; flex-wrap: wrap; }
.hero-stats span { padding: 6px 10px; border: 1px solid var(--border); border-radius: 999px; color: var(--muted); background: color-mix(in srgb, var(--surface-solid) 72%, transparent); font-size: 11px; }
.deck-hero-actions { position: relative; z-index: 2; display: flex; align-items: flex-start; gap: 8px; }
.more-menu { position: relative; }
.more-menu > summary { list-style: none; }
.more-menu > summary::-webkit-details-marker { display: none; }
.more-popover { position: absolute; z-index: 4; top: calc(100% + 7px); right: 0; display: grid; width: 180px; padding: 6px; border: 1px solid var(--border); border-radius: 13px; background: var(--surface-solid); box-shadow: var(--shadow); }
.more-popover button, .more-popover a { padding: 10px; border: 0; border-radius: 8px; color: var(--text); background: none; text-align: left; text-decoration: none; cursor: pointer; }
.more-popover button:hover, .more-popover a:hover { background: var(--surface-2); }
.more-popover .danger { color: var(--danger); }
.cards-section { padding-bottom: 30px; }
.card-list { display: grid; gap: 10px; }
.library-card { display: grid; padding: 17px 18px; align-items: center; border: 1px solid var(--border); border-radius: 15px; grid-template-columns: minmax(0, 1fr) 1px minmax(0, 1fr) auto; gap: 20px; background: var(--surface-solid); transition: border var(--transition), transform var(--transition); }
.library-card:hover { border-color: var(--border-strong); transform: translateX(2px); }
.library-card .divider { width: 1px; height: 45px; background: var(--border); }
.card-copy { min-width: 0; }
.card-copy small { display: block; margin-bottom: 4px; color: var(--faint); font-size: 9px; font-weight: 800; letter-spacing: .11em; }
.card-copy p { overflow: hidden; margin: 0; text-overflow: ellipsis; white-space: nowrap; }
.card-tools { display: flex; gap: 3px; }
.tiny-button { display: grid; width: 33px; height: 33px; padding: 0; place-items: center; border: 0; border-radius: 9px; color: var(--muted); background: transparent; cursor: pointer; }
.tiny-button:hover { color: var(--primary); background: var(--primary-soft); }
.tiny-button.danger:hover { color: var(--danger); background: var(--danger-soft); }
.due-dot { display: inline-block; width: 6px; height: 6px; margin-right: 5px; border-radius: 50%; background: var(--primary); }

.study-view { background: radial-gradient(circle at 50% 35%, color-mix(in srgb, var(--primary) 8%, transparent), transparent 36%); }
.study-wrap { width: min(100% - 38px, 900px); margin: 0 auto; padding: 26px 0 70px; }
.study-header { display: grid; align-items: center; grid-template-columns: 1fr auto 1fr; }
.study-header .back-button { margin: 0; justify-self: start; }
.study-header .icon-button { justify-self: end; }
.study-title { display: grid; justify-items: center; }
.study-title span { font-family: var(--serif); font-size: 19px; font-weight: 600; }
.study-title small { color: var(--faint); font-size: 10px; }
.study-progress { height: 5px; margin: 22px 0 52px; overflow: hidden; border-radius: 99px; background: var(--surface-3); }
.study-progress progress::-webkit-progress-value { border-radius: inherit; background: var(--primary); transition: width 280ms ease; }
.study-progress progress::-moz-progress-bar { border-radius: inherit; background: var(--primary); }
.study-stage { display: grid; justify-items: center; }
.flip-scene { width: min(100%, 670px); height: min(52vh, 430px); min-height: 330px; perspective: 1200px; }
.flashcard { position: relative; width: 100%; height: 100%; padding: 0; border: 0; background: transparent; cursor: pointer; transform-style: preserve-3d; transition: transform 520ms cubic-bezier(.2,.72,.2,1); }
.flashcard.is-flipped { transform: rotateY(180deg); }
.flash-face { position: absolute; inset: 0; display: flex; padding: clamp(31px, 6vw, 68px); align-items: center; justify-content: center; overflow: auto; border: 1px solid var(--border); border-radius: 30px; backface-visibility: hidden; background: var(--card-face); box-shadow: var(--shadow); }
.flash-back { border-color: color-mix(in srgb, var(--primary) 28%, var(--border)); background: linear-gradient(145deg, var(--card-face), color-mix(in srgb, var(--primary) 7%, var(--card-face))); transform: rotateY(180deg); }
.face-label { position: absolute; top: 25px; left: 28px; color: var(--primary); font-size: 10px; font-weight: 850; letter-spacing: .14em; }
.flash-face p { margin: 0; white-space: pre-wrap; font-family: var(--serif); font-size: clamp(25px, 4vw, 39px); line-height: 1.35; text-align: center; }
.flip-note { position: absolute; right: 26px; bottom: 21px; color: var(--faint); font-size: 10px; }
.study-hint { min-height: 25px; margin: 17px 0 14px; color: var(--muted); font-size: 13px; text-align: center; }
.hint-button { border: 0; color: var(--primary); background: none; font-weight: 700; cursor: pointer; }
.rating-area { min-height: 79px; }
.rating-prompt { margin: 0 0 9px; color: var(--faint); font-size: 10px; font-weight: 800; letter-spacing: .1em; text-align: center; text-transform: uppercase; }
.rating-buttons { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; }
.rating-button { display: grid; min-width: 105px; padding: 11px 16px 8px; border: 1px solid var(--border); border-radius: 12px; background: var(--surface-solid); cursor: pointer; }
.rating-button b { font-size: 12px; }
.rating-button small { color: var(--faint); font-size: 9px; }
.rating-button:hover { border-color: var(--rating); background: color-mix(in srgb, var(--rating) 8%, var(--surface-solid)); }
.rating-again { --rating: #d65a6d; } .rating-hard { --rating: #d18a59; } .rating-good { --rating: #6c9fc4; } .rating-easy { --rating: #55a07f; }
.study-help { margin-top: 20px; color: var(--faint); font-size: 10px; text-align: center; }
.study-complete { width: min(100%, 610px); padding: 55px 38px; border: 1px solid var(--border); border-radius: 30px; background: var(--surface-solid); box-shadow: var(--shadow); text-align: center; }
.completion-bloom { display: inline-grid; width: 76px; height: 76px; place-items: center; border-radius: 25px; color: var(--primary); background: var(--primary-soft); font-size: 38px; }
.study-complete h2 { margin: 22px 0 8px; font-family: var(--serif); font-size: 39px; font-weight: 600; }
.study-complete p { margin: 0 auto 25px; color: var(--muted); }
.completion-actions { display: flex; justify-content: center; gap: 9px; }

.modal { width: min(calc(100% - 30px), 540px); max-height: calc(100vh - 40px); padding: 0; overflow: auto; border: 1px solid var(--border); border-radius: 23px; color: var(--text); background: var(--surface-solid); box-shadow: var(--shadow); }
.modal::backdrop { background: rgba(35, 20, 28, .46); backdrop-filter: blur(5px); }
.modal > form, .settings-content { padding: 27px; }
.modal header { display: flex; margin-bottom: 24px; align-items: flex-start; justify-content: space-between; gap: 20px; }
.modal-close { width: 35px; height: 35px; border: 0; border-radius: 10px; color: var(--muted); background: var(--surface-2); cursor: pointer; font-size: 21px; }
.modal .field { margin-bottom: 18px; }
.modal footer { display: flex; margin-top: 26px; justify-content: flex-end; gap: 8px; }
.modal-wide { width: min(calc(100% - 30px), 760px); }
.card-fields { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.accent-picker { margin: 0; padding: 0; border: 0; }
.accent-picker > div { display: grid; margin-top: 8px; grid-template-columns: repeat(6, 1fr); gap: 8px; }
.accent-picker label { display: grid; padding: 9px 4px 6px; justify-items: center; gap: 5px; border: 1px solid var(--border); border-radius: 11px; cursor: pointer; }
.accent-picker label:has(input:checked) { border-color: var(--primary); background: var(--primary-soft); }
.accent-picker input { position: absolute; width: 1px; height: 1px; opacity: 0; }
.accent-picker small { color: var(--muted); font-size: 9px; }
.accent { width: 25px; height: 25px; border: 3px solid rgba(255,255,255,.65); border-radius: 50%; box-shadow: 0 0 0 1px var(--border-strong); }
.accent.rose { background: #df7099; } .accent.peach { background: #dd9368; } .accent.lilac { background: #9272ba; } .accent.sky { background: #659ecc; } .accent.mint { background: #5d9f83; } .accent.berry { background: #b64f78; }
.settings-block { padding: 20px 0; border-top: 1px solid var(--border); }
.settings-block h3 { margin: 0 0 16px; font-size: 13px; }
.settings-block .button { justify-self: start; }
.settings-actions { display: flex; padding-bottom: 0; justify-content: space-between; align-items: center; }
.text-danger { padding: 8px; border: 0; color: var(--danger); background: none; font-size: 12px; font-weight: 700; cursor: pointer; }
.confirm-modal { width: min(calc(100% - 30px), 430px); text-align: center; }
.confirm-modal form { padding: 35px; }
.confirm-icon { display: inline-grid; width: 50px; height: 50px; place-items: center; border-radius: 16px; color: var(--danger); background: var(--danger-soft); font-weight: 850; }
.confirm-modal h2 { margin: 17px 0 6px; }
.confirm-modal p { margin: 0; color: var(--muted); }
.confirm-modal .field { margin-top: 22px; text-align: left; }
.confirm-modal footer { justify-content: center; }

.toast-region { position: fixed; z-index: 100; right: 20px; bottom: 20px; display: grid; width: min(360px, calc(100% - 40px)); gap: 9px; pointer-events: none; }
.toast { display: flex; padding: 13px 15px; align-items: center; gap: 10px; border: 1px solid var(--border); border-radius: 13px; color: var(--text); background: var(--surface-solid); box-shadow: var(--shadow); animation: toast-in 220ms ease both; }
.toast::before { width: 8px; height: 8px; border-radius: 50%; content: ""; background: var(--success); }
.toast.error::before { background: var(--danger); }
.toast span { font-size: 12px; font-weight: 650; }
@keyframes toast-in { from { opacity: 0; transform: translateY(8px); } }

@media (max-width: 980px) {
  .topbar { grid-template-columns: 1fr minmax(220px, 350px) auto; }
  .avatar-copy, .avatar-button > span:last-child { display: none; }
  .stat-grid { grid-template-columns: 1fr 1fr; }
  .deck-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 680px) {
  .topbar { height: 66px; padding: 0 16px; grid-template-columns: 1fr auto; }
  .topbar .brand { font-size: 0; }
  .topbar .brand-mark { transform: scale(.9); }
  .global-search { position: absolute; top: 76px; right: 16px; left: 16px; display: none; box-shadow: var(--shadow); }
  .global-search.mobile-visible { display: flex; }
  .content-wrap, .content-wrap.narrow { width: min(100% - 28px, 1180px); padding-top: 42px; }
  .welcome-row { align-items: flex-start; flex-direction: column; }
  .welcome-row .button { width: 100%; }
  .stat-grid { margin: 32px 0 44px; grid-template-columns: 1fr 1fr; gap: 9px; }
  .stat-card { min-height: 100px; padding: 15px; grid-template-columns: 38px 1fr; }
  .stat-icon { width: 37px; height: 37px; border-radius: 11px; font-size: 17px; }
  .stat-card > small { display: none; }
  .deck-grid { grid-template-columns: 1fr; }
  .deck-card { min-height: 220px; }
  .deck-hero { padding: 26px; grid-template-columns: 1fr; }
  .deck-hero-actions { justify-content: flex-start; }
  .library-card { align-items: start; grid-template-columns: 1fr auto; }
  .library-card .divider { display: none; }
  .library-card .card-copy:nth-of-type(2) { grid-row: 2; }
  .library-card .card-tools { grid-column: 2; grid-row: 1 / span 2; }
  .study-wrap { width: min(100% - 24px, 900px); padding-top: 18px; }
  .study-header { grid-template-columns: 1fr auto; }
  .study-title { display: none; }
  .study-progress { margin: 17px 0 31px; }
  .flip-scene { height: 48vh; min-height: 310px; }
  .flash-face { border-radius: 22px; }
  .rating-buttons { grid-template-columns: 1fr 1fr; }
  .rating-button { min-width: 0; }
  .study-help { display: none; }
  .card-fields { grid-template-columns: 1fr; }
  .accent-picker > div { grid-template-columns: repeat(3, 1fr); }
  .modal > form, .settings-content { padding: 22px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}

.workspace-bar { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 10px; padding: 14px clamp(20px, 4.5vw, 74px); color: var(--muted); font-size: 12px; border-bottom: 1px solid var(--border); }
.library-tools { display: flex; align-items: center; flex-wrap: wrap; gap: 8px; }
.settings-block p, #install-dialog p { color: var(--muted); line-height: 1.7; }
.settings-block .field { margin-bottom: 16px; }
.install-button { white-space: nowrap; padding: 10px 14px; }
.boot-screen p { max-width: 440px; padding: 0 24px; text-align: center; }
@media (max-width: 980px) { .topbar { grid-template-columns: auto minmax(140px, 1fr) auto; gap: 20px; } }
@media (max-width: 680px) {
  .topbar { grid-template-columns: 1fr auto; gap: 8px; }
  .workspace-bar { gap: 6px; padding: 10px 16px; flex-direction: column; align-items: flex-start; }
  .section-heading { flex-wrap: wrap; gap: 16px; }
  .library-tools { gap: 5px; }
  .library-tools .button { padding: 9px 12px; }
}

/* Collection tools and recovery */
.notice-bar { display: flex; justify-content: space-between; align-items: center; gap: 18px; padding: 18px 22px; margin-bottom: 18px; border: 1px solid var(--border); border-radius: 16px; background: var(--primary-soft); }
.notice-bar p { margin: 4px 0 0; color: var(--muted); font-size: 13px; }
.notice-bar b { font-size: 14px; }
.field-note { font-size: 12px; color: var(--muted); line-height: 1.6; }
.collection-filters, .card-library-toolbar { display: flex; align-items: flex-end; flex-wrap: wrap; gap: 12px; margin-bottom: 20px; }
.collection-filters .field { min-width: 155px; margin: 0; }
.card-library-toolbar .field { flex: 1; min-width: 200px; }
select { min-height: 42px; max-width: 100%; border: 1px solid var(--border); border-radius: 11px; background: var(--surface-solid); color: var(--text); padding: 9px 32px 9px 12px; font: inherit; }
button[aria-pressed="true"]:not(.flashcard) { color: var(--primary-ink); background: var(--primary-soft); border-color: var(--primary); }
.favorite-button { z-index: 1; position: absolute; top: 15px; right: 15px; display: grid; place-items: center; width: 36px; height: 36px; border: 1px solid var(--border); border-radius: 11px; color: var(--primary-ink); background: var(--surface-solid); cursor: pointer; font-size: 22px; }
.tag-list { display: flex; flex-wrap: wrap; gap: 5px; margin-top: 8px; }
.tag-list span { padding: 3px 7px; border-radius: 7px; background: var(--primary-soft); color: var(--primary-ink); font-size: 10px; overflow-wrap: anywhere; }
.deck-card .deck-meta { padding-right: 34px; }
.deck-hero { overflow: visible; }
.deck-hero::after { display: none; }
.library-card { grid-template-columns: minmax(0, 1fr) 1px minmax(0, 1fr) auto; }
.pagination { display: flex; justify-content: center; align-items: center; gap: 18px; margin-top: 22px; }
.pagination span { font-size: 12px; color: var(--muted); }
.check-field { display: flex; gap: 10px; align-items: center; margin: 16px 0; font-size: 13px; }
.check-field input { width: 18px; height: 18px; padding: 0; accent-color: var(--primary); }
.image-fields { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; padding: 18px; margin-bottom: 18px; background: var(--surface-2); border-radius: 14px; }
.image-fields input[type=file] { max-width: 100%; min-width: 0; padding: 8px; font-size: 11px; }
.image-preview { display: block; max-height: 130px; max-width: 100%; object-fit: contain; margin-bottom: 10px; border-radius: 10px; }
.bulk-preview { max-height: 300px; overflow: auto; margin-top: 18px; font-size: 13px; }
.bulk-preview table { border-collapse: collapse; width: 100%; table-layout: fixed; }
.bulk-preview td, .bulk-preview th { border-bottom: 1px solid var(--border); padding: 10px; text-align: left; vertical-align: top; overflow-wrap: anywhere; white-space: pre-wrap; }
.trash-item { display: flex; align-items: center; justify-content: space-between; gap: 15px; padding: 16px 0; border-bottom: 1px solid var(--border); }
.trash-item > div { min-width: 0; overflow-wrap: anywhere; }
.trash-item p { margin: 4px 0; color: var(--muted); font-size: 12px; }
#empty-trash { margin-top: 22px; }
.toast { gap: 12px; }
.toast button { pointer-events: auto; border: 0; background: var(--primary-soft); border-radius: 7px; padding: 6px 10px; color: var(--primary-ink); cursor: pointer; }
.progress-panel { border: 1px solid var(--border); border-radius: 18px; background: var(--surface); padding: 18px 22px; margin: 0 0 32px; }
.progress-panel summary { cursor: pointer; color: var(--text); font-weight: 650; font-size: 14px; }
.progress-panel summary span { margin-left: 12px; color: var(--muted); font-size: 12px; font-weight: normal; }
.progress-detail { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; margin-top: 20px; }
.progress-detail h3 { font-size: 15px; }
.upcoming-row { display: grid; grid-template-columns: 80px 1fr 35px; gap: 12px; align-items: center; margin: 10px 0; font-size: 12px; }
.upcoming-row progress { accent-color: var(--primary); width: 100%; height: 8px; }
.practice-link { display: grid; width: 100%; gap: 4px; border: 0; border-bottom: 1px solid var(--border); padding: 10px 0; background: transparent; color: var(--text); text-align: left; cursor: pointer; }
.practice-link b { font-size: 12px; overflow-wrap: anywhere; }
.practice-link small { color: var(--muted); font-size: 11px; }

/* Stable card size, explicit navigation, and accessible front/back content. */
.study-progress { margin-bottom: 22px; }
.study-toolbar { width: min(100%, 710px); display: flex; justify-content: space-between; align-items: center; gap: 12px; margin-bottom: 18px; }
.study-toolbar label { display: flex; gap: 10px; align-items: center; min-width: 0; color: var(--muted); font-size: 12px; }
.study-toolbar select { width: 250px; min-width: 0; font-size: 12px; }
.flip-scene { width: min(100%, 710px); min-height: 310px; height: min(50vh, 470px); touch-action: pan-y; }
.flashcard { transition: transform 320ms ease; }
.rich-card-content { display: flex; flex-direction: column; gap: 15px; align-items: center; width: 100%; margin: auto 0; font-family: var(--serif); font-size: var(--card-font, clamp(23px, 3.4vw, 34px)); line-height: 1.5; text-align: center; overflow-wrap: anywhere; }
.rich-card-content > span { width: 100%; }
.rich-card-content code { font-family: monospace; font-size: .8em; padding: 2px 6px; border-radius: 5px; background: var(--primary-soft); }
html[data-card-size="large"] { --card-font: clamp(28px, 4vw, 42px); }
html[data-card-size="larger"] { --card-font: clamp(33px, 4.5vw, 50px); }
.flash-face { justify-content: flex-start; flex-direction: column; padding: 55px 28px 30px; }
.study-image { max-width: 100%; max-height: 190px; object-fit: contain; border-radius: 10px; flex-shrink: 0; }
.study-navigation { display: grid; grid-template-columns: 1fr auto 1fr; width: min(100%, 710px); gap: 12px; margin-top: 20px; }
.study-navigation > :first-child { justify-self: start; }
.study-navigation > :last-child { justify-self: end; }
.rating-area { min-height: 105px; }
.concealed { visibility: hidden; pointer-events: none; }
.card-enter { animation: card-enter 140ms ease-out; }
.study-help { line-height: 1.8; margin-top: 10px; }
.study-focus .topbar, .study-focus .workspace-bar { display: none; }
.study-focus .study-wrap { padding-top: 24px; }
@keyframes card-enter { from { opacity: .4; transform: translateY(6px); } to { opacity: 1; transform: translateY(0); } }
@media (max-width: 980px) { .library-card { gap: 12px; } .card-tools { flex-wrap: wrap; max-width: 70px; } }
@media (max-width: 680px) {
  .notice-bar { align-items: flex-start; flex-direction: column; padding: 16px; }
  .collection-filters .field { flex: 1; min-width: 110px; }
  .progress-detail, .image-fields { grid-template-columns: 1fr; }
  .progress-panel { padding: 16px; }
  .progress-panel summary span { display: block; margin: 7px 0 0; }
  .library-card { grid-template-columns: minmax(0, 1fr) auto; }
  .library-card .divider { display: none; }
  .library-card .card-copy:nth-of-type(2) { grid-column: 1; }
  .card-tools { grid-column: 2; grid-row: 1 / span 2; }
  .study-toolbar { align-items: flex-start; }
  .study-toolbar label { flex-direction: column; align-items: flex-start; gap: 5px; width: 55%; }
  .study-toolbar select { width: 100%; }
  .study-toolbar .button { padding: 10px; font-size: 11px; }
  .study-navigation { gap: 3px; }
  .study-navigation .button { font-size: 11px; padding: 11px 9px; }
  .flip-scene { height: 42vh; min-height: 280px; }
  .flash-face { padding: 48px 20px 20px; }
  .completion-actions { flex-wrap: wrap; }
  .modal footer { flex-wrap: wrap; }
}
@media (prefers-reduced-motion: reduce) { .card-enter { animation: none; } .flashcard { transition: none; } html { scroll-behavior: auto; } }

@media (max-width: 680px) {
  .topbar { height: auto; min-height: 66px; padding-top: 12px; padding-bottom: 12px; }
  .top-actions { grid-column: 2; grid-row: 1; }
  .global-search { position: static; display: flex; grid-column: 1 / -1; grid-row: 2; width: 100%; margin-top: 5px; box-shadow: none; }
  .study-title { display: flex; grid-row: 2; grid-column: 1 / -1; align-items: center; gap: 5px; padding-top: 10px; }
}