/* ================================================================
 *  Letters Font — Neumorphic Design System
 *  对齐前端模板 design tokens | 新拟态 + 极光 + 动画网格 + Spotlight
 *  ================================================================ */

/* ===== Design Tokens ===== */
:root {
    --background: #f8fafc;
    --foreground: #374151;
    --card: #ffffff;
    --card-foreground: #1f2937;
    --primary: #374151;
    --primary-foreground: #ffffff;
    --secondary: #6366f1;
    --secondary-foreground: #ffffff;
    --muted: #f0f4f8;
    --muted-foreground: #6b7280;
    --accent: #6366f1;
    --accent-foreground: #ffffff;
    --destructive: #b91c1c;
    --destructive-foreground: #ffffff;
    --border: #e5e7eb;
    --input: #ffffff;
    --ring: rgba(99,102,241,0.5);
    --radius: 0.75rem;
    --font-heading: 'Space Grotesk','Sora',system-ui,sans-serif;
    --font-body: 'DM Sans','Inter',system-ui,-apple-system,sans-serif;
    --brand: #6366f1;
    --brand-light: #818cf8;
    --brand-dark: #4f46e5;
    --shadow-neumorphic: 8px 8px 16px rgba(163,177,198,0.15),-8px -8px 16px rgba(255,255,255,0.7);
    --shadow-neumorphic-inset: inset 4px 4px 8px rgba(163,177,198,0.15),inset -4px -4px 8px rgba(255,255,255,0.7);
    --shadow-card: 0 1px 3px rgba(0,0,0,0.04);
    --shadow-card-hover: 12px 12px 24px rgba(163,177,198,0.2),-12px -12px 24px rgba(255,255,255,0.8);
    --px-margin-mobile: 1rem;
    --px-margin-desktop: 2rem;
    --transition-fast: 150ms;
    --transition-normal: 300ms;
}

.dark {
    --background: #1a1a1a;
    --foreground: #f1f5f9;
    --card: #2a2a2a;
    --card-foreground: #f1f5f9;
    --primary: #f1f5f9;
    --primary-foreground: #1a1a1a;
    --secondary: #7c3aed;
    --secondary-foreground: #f8fafc;
    --muted: #262626;
    --muted-foreground: #a3a3a3;
    --accent: #7c3aed;
    --accent-foreground: #f8fafc;
    --destructive: #dc2626;
    --destructive-foreground: #f8fafc;
    --border: #404040;
    --input: #2a2a2a;
    --ring: rgba(124,58,237,0.5);
    --shadow-neumorphic: 8px 8px 16px rgba(0,0,0,0.3),-8px -8px 16px rgba(255,255,255,0.03);
    --shadow-neumorphic-inset: inset 4px 4px 8px rgba(0,0,0,0.3),inset -4px -4px 8px rgba(255,255,255,0.03);
    --shadow-card: 0 1px 3px rgba(0,0,0,0.2);
    --shadow-card-hover: 12px 12px 24px rgba(0,0,0,0.4),-12px -12px 24px rgba(255,255,255,0.05);
}

/* ===== Reset & Base ===== */
*,*::before,*::after{box-sizing:border-box}
html{font-size:110%;scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;font-family:var(--font-body);background:var(--background);color:var(--foreground);min-height:100vh;display:flex;flex-direction:column;transition:background var(--transition-normal),color var(--transition-normal);line-height:1.6;overflow-x:hidden}
a{color:var(--accent);text-decoration:none;transition:color var(--transition-fast)}
a:hover{color:var(--brand-dark)}

/* ===== HEADER ===== */
.header-brand{display:flex;align-items:center;gap:0.5rem;text-decoration:none;color:var(--foreground)}
.header-brand-icon{width:28px;height:28px;object-fit:contain}
.header-brand span{font-size:1.25rem;font-weight:700;color:var(--brand);letter-spacing:-0.02em;font-family:var(--font-heading)}

.header-row{display:flex;align-items:center;justify-content:space-between;width:100%;padding:0.75rem 1rem;max-width:72rem;margin:0 auto}
.hamburger-btn{display:none;color:var(--muted-foreground);background:none;border:none;cursor:pointer;font-size:1.5rem}
.header-nav{display:flex;align-items:center;gap:1.5rem;margin-left:auto}
@media(max-width:768px){.hamburger-btn{display:block}.header-nav{display:none}.header-brand{position:absolute;left:50%;transform:translateX(-50%)}}
.theme-toggle-btn{display:flex;align-items:center;justify-content:center;width:2.25rem;height:2.25rem;border:none;background:transparent;color:var(--muted-foreground);cursor:pointer;transition:all var(--transition-fast);margin-left:0.5rem}
.theme-icon-light{display:block}.dark .theme-icon-light{display:none}
.theme-icon-dark{display:none}.dark .theme-icon-dark{display:block}
.theme-toggle-btn:hover{color:var(--accent)}

/* ===== HERO / AURORA ===== */
.hero-section{position:relative;text-align:center;padding:4rem 1rem 4rem;overflow:hidden}
.aurora-bg{position:absolute;inset:0;z-index:0;pointer-events:none;opacity:0.5}
.aurora-bg::before{content:'';position:absolute;inset:0;background:linear-gradient(135deg,rgba(99,102,241,0.12) 0%,rgba(124,58,237,0.06) 33%,rgba(99,102,241,0.12) 66%,rgba(124,58,237,0.06) 100%);background-size:400% 400%;animation:aurora 8s ease-in-out infinite}
@keyframes aurora{0%,100%{background-position:0% 50%}50%{background-position:100% 50%}}

.hero-content{position:relative;z-index:1}
.hero-title{font-family:var(--font-heading);font-size:clamp(2.5rem,6vw,4rem);font-weight:700;line-height:1.1;color:var(--foreground);margin:0 0 0.75rem;letter-spacing:-0.03em}
.hero-subtitle{font-size:1.125rem;color:var(--muted-foreground);max-width:36rem;margin:0 auto;line-height:1.6}

.gradient-text{background:linear-gradient(135deg,var(--brand) 0%,var(--brand-light) 50%,#a78bfa 100%);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}

/* ===== PARTICLES (10 particles) ===== */
.floating-particles{position:absolute;inset:0;z-index:0;pointer-events:none;overflow:hidden}
.particle{position:absolute;border-radius:50%;opacity:0;animation:float-particle linear infinite}
.particle:nth-child(1){width:6px;height:6px;background:var(--accent);top:10%;left:15%;animation-duration:18s;animation-delay:0s}
.particle:nth-child(2){width:4px;height:4px;background:var(--brand-light);top:25%;left:70%;animation-duration:22s;animation-delay:-3s}
.particle:nth-child(3){width:8px;height:8px;background:var(--brand);top:55%;left:10%;animation-duration:15s;animation-delay:-7s}
.particle:nth-child(4){width:5px;height:5px;background:#a78bfa;top:70%;left:80%;animation-duration:25s;animation-delay:-5s}
.particle:nth-child(5){width:3px;height:3px;background:var(--accent);top:40%;left:50%;animation-duration:20s;animation-delay:-10s}
.particle:nth-child(6){width:7px;height:7px;background:var(--brand-light);top:85%;left:40%;animation-duration:17s;animation-delay:-2s}
.particle:nth-child(7){width:5px;height:5px;background:#a78bfa;top:15%;left:60%;animation-duration:19s;animation-delay:-4s}
.particle:nth-child(8){width:4px;height:4px;background:var(--brand-light);top:75%;left:25%;animation-duration:21s;animation-delay:-8s}
.particle:nth-child(9){width:6px;height:6px;background:var(--accent);top:50%;left:85%;animation-duration:16s;animation-delay:-6s}
.particle:nth-child(10){width:3px;height:3px;background:var(--brand);top:90%;left:10%;animation-duration:23s;animation-delay:-11s}
@keyframes float-particle{0%,100%{transform:translateY(0)translateX(0)scale(1);opacity:0}10%,90%{opacity:0.6}25%{transform:translateY(-30px)translateX(20px)scale(1.2)}50%{transform:translateY(-15px)translateX(-15px)scale(0.9)}75%{transform:translateY(-40px)translateX(10px)scale(1.1)}}

/* ===== LOVE CALCULATOR CORE ===== */
:root{--love-pink:#ff4d8d;--love-pink-dark:#e23673;--love-glow:rgba(255,77,141,0.35)}
.love-calc-container{position:relative;z-index:10;width:100%;max-width:42rem;margin:2.5rem auto 3rem;padding:0 var(--px-margin-mobile)}
.love-calc-card{position:relative;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-neumorphic);padding:2rem 1.5rem;overflow:hidden}

/* Input form */
.lc-form{display:flex;align-items:flex-end;justify-content:center;gap:0.75rem;flex-wrap:wrap}
.lc-field{display:flex;flex-direction:column;gap:0.4rem;flex:1;min-width:11rem}
.lc-label{font-size:0.7rem;font-weight:700;color:var(--muted-foreground);text-transform:uppercase;letter-spacing:0.06em}
.lc-input{width:100%;padding:0.85rem 1rem;font-size:1rem;background:var(--card);border:1.5px solid var(--border);border-radius:100px;color:var(--foreground);font-family:var(--font-body);outline:none;transition:border-color var(--transition-fast),box-shadow var(--transition-fast);box-shadow:var(--shadow-neumorphic-inset)}
.lc-input:focus{border-color:var(--love-pink);box-shadow:0 0 0 3px var(--love-glow)}
.lc-input::placeholder{color:var(--muted-foreground);opacity:0.55}
.lc-heart-divider{font-size:1.5rem;color:var(--love-pink);padding-bottom:0.6rem;animation:lc-pulse 1.6s ease-in-out infinite}
@keyframes lc-pulse{0%,100%{transform:scale(1)}50%{transform:scale(1.18)}}

/* Calculate button */
.lc-calc-btn{display:flex;align-items:center;justify-content:center;gap:0.5rem;width:100%;margin-top:1.5rem;padding:0.95rem 1.5rem;border:none;border-radius:100px;font-size:1rem;font-weight:700;font-family:var(--font-heading);color:#fff;background:linear-gradient(135deg,var(--love-pink),var(--love-pink-dark));cursor:pointer;transition:transform var(--transition-fast),box-shadow var(--transition-fast);box-shadow:0 6px 18px var(--love-glow)}
.lc-calc-btn:hover{transform:translateY(-2px);box-shadow:0 10px 26px var(--love-glow)}
.lc-calc-btn:active{transform:translateY(0)}
.lc-calc-btn:disabled{opacity:0.7;cursor:not-allowed;transform:none}
.lc-calc-btn-spinner{display:none;width:16px;height:16px;border:2px solid rgba(255,255,255,0.4);border-top-color:#fff;border-radius:50%;animation:lc-spin 0.7s linear infinite}
.lc-calc-btn.is-loading .lc-calc-btn-spinner{display:inline-block}
@keyframes lc-spin{to{transform:rotate(360deg)}}

/* Loading */
.lc-loading{text-align:center;margin-top:1.25rem;font-size:0.95rem;color:var(--love-pink);font-weight:600}
.lc-loading.is-error{color:#ef4444}

/* Result */
.lc-result{margin-top:1.75rem;opacity:0;transform:translateY(10px);transition:opacity 0.4s ease,transform 0.4s ease}
.lc-result.show{opacity:1;transform:translateY(0)}
.lc-score-wrap{text-align:center;margin-bottom:1.5rem}
.lc-heart-meter{position:relative;width:100%;max-width:18rem;height:0.6rem;margin:0 auto 1rem;background:var(--muted);border-radius:100px;overflow:hidden;border:1px solid var(--border)}
.lc-heart-meter-fill{height:100%;width:0;background:linear-gradient(90deg,var(--love-pink),var(--love-pink-dark));border-radius:100px;transition:width 1s cubic-bezier(0.22,1,0.36,1)}
.lc-score{font-family:var(--font-heading);font-size:3.5rem;font-weight:700;line-height:1}
.lc-couple-names{margin-top:0.5rem;font-size:1rem;font-weight:600;color:var(--foreground)}

/* Dimensions (A1) */
.lc-dimensions{display:flex;flex-direction:column;gap:0.85rem;margin-bottom:1.5rem}
.lc-dim-head{display:flex;justify-content:space-between;font-size:0.82rem;margin-bottom:0.35rem}
.lc-dim-label{color:var(--muted-foreground);font-weight:600}
.lc-dim-val{color:var(--love-pink);font-weight:700}
.lc-dim-bar{height:0.45rem;background:var(--muted);border-radius:100px;overflow:hidden;border:1px solid var(--border)}
.lc-dim-bar-fill{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--love-pink),var(--love-pink-dark));border-radius:100px;animation:lc-grow 0.9s cubic-bezier(0.22,1,0.36,1) forwards}
@keyframes lc-grow{from{width:0}}

/* Tier message */
.lc-tier-msg{text-align:center;font-size:1.05rem;color:var(--foreground);margin:0 0 1.25rem;font-weight:600}

/* Couple message card */
.lc-couple-msg-card{background:var(--muted);border-left:3px solid var(--love-pink);border-radius:0.6rem;padding:1rem 1.1rem;margin-bottom:1.5rem}
.lc-couple-msg-label{display:block;font-size:0.65rem;text-transform:uppercase;letter-spacing:0.1em;color:var(--love-pink);font-weight:700;margin-bottom:0.5rem}
.lc-couple-msg{margin:0;font-size:0.95rem;line-height:1.65;color:var(--foreground);font-style:italic}

/* Result actions */
.lc-result-actions{display:flex;gap:0.6rem;flex-wrap:wrap;margin-bottom:1.25rem}
.lc-btn{display:inline-flex;align-items:center;justify-content:center;gap:0.4rem;flex:1;min-width:9rem;padding:0.75rem 1.1rem;border:none;border-radius:100px;font-size:0.85rem;font-weight:700;font-family:var(--font-body);cursor:pointer;transition:all var(--transition-fast)}
.lc-btn svg{flex-shrink:0}
.lc-btn-primary{background:linear-gradient(135deg,var(--love-pink),var(--love-pink-dark));color:#fff;box-shadow:0 4px 14px var(--love-glow)}
.lc-btn-primary:hover{transform:translateY(-1px)}
.lc-btn-secondary{background:var(--card);color:var(--muted-foreground);border:1.5px solid var(--border)}
.lc-btn-secondary:hover{background:var(--muted);color:var(--foreground)}

/* Share link */
.lc-share-link-wrap{display:flex;flex-direction:column;gap:0.4rem;margin-bottom:1rem}
.lc-share-link-label{font-size:0.7rem;font-weight:700;color:var(--muted-foreground);text-transform:uppercase;letter-spacing:0.06em}
.lc-share-link{width:100%;padding:0.65rem 0.85rem;font-size:0.8rem;background:var(--muted);border:1.5px solid var(--border);border-radius:0.5rem;color:var(--muted-foreground);font-family:var(--font-mono,monospace);outline:none}

/* Disclaimer (D11) */
.lc-disclaimer{text-align:center;font-size:0.72rem;color:var(--muted-foreground);opacity:0.8;margin:0}

/* History (B5) */
.lc-history{margin-top:1.5rem;padding-top:1.25rem;border-top:1px solid var(--border)}
.lc-history-title{font-size:0.68rem;font-weight:700;color:var(--muted-foreground);text-transform:uppercase;letter-spacing:0.08em;margin-bottom:0.6rem}
.lc-history-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:0.35rem}
.lc-history-item{display:flex;justify-content:space-between;align-items:center;padding:0.5rem 0.75rem;background:var(--muted);border:1px solid var(--border);border-radius:0.5rem;cursor:pointer;transition:border-color var(--transition-fast)}
.lc-history-item:hover{border-color:var(--love-pink)}
.lc-history-names{font-size:0.85rem;color:var(--foreground)}
.lc-history-score{font-size:0.85rem;font-weight:700;color:var(--love-pink)}

/* Export canvas (A2) — offscreen */
.lc-export-canvas{display:none}

/* Floating hearts (B6) */
.lc-hearts{position:absolute;inset:0;pointer-events:none;overflow:hidden}
.lc-heart{position:absolute;bottom:-2rem;color:var(--love-pink);opacity:0.85;animation:lc-float linear forwards}
@keyframes lc-float{0%{transform:translateY(0) scale(0.9);opacity:0}15%{opacity:0.85}100%{transform:translateY(-120%) scale(1.3);opacity:0}}

/* Desktop refinements */
@media(min-width:640px){
    .love-calc-card{padding:2.5rem 2.25rem}
    .lc-form{flex-wrap:nowrap}
}

/* ===== SECTION TITLE ===== */
.section-title{font-family:var(--font-heading);font-size:1.1rem;font-weight:700;color:var(--foreground);padding:1rem 0 0.5rem;margin:0;grid-column:1/-1;border-bottom:2px solid var(--border);display:flex;align-items:center;gap:0.4rem}
.section-title svg{flex-shrink:0}
.section-title:first-child{padding-top:0}

/* ===== FONT GRID (single column) ===== */
.font-grid{display:grid;grid-template-columns:1fr;gap:1.375rem;padding-bottom:2rem}

.font-card{position:relative;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:1rem;display:flex;flex-direction:column;gap:0.5rem;transition:all var(--transition-normal);box-shadow:var(--shadow-neumorphic);overflow:hidden}
.font-card::before{content:'';position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,rgba(99,102,241,0.06),transparent);transition:left 0.5s ease;pointer-events:none}
.font-card:hover::before{left:100%}
.font-card:hover{box-shadow:var(--shadow-card-hover);border-color:var(--accent);transform:translateY(-2px)}

.font-preview{font-size:1.15rem;line-height:1.4;color:var(--foreground);word-break:break-all;min-height:2.5rem;padding:0.5rem;background:var(--muted);border-radius:0.5rem;transition:font-size var(--transition-fast);box-shadow:var(--shadow-neumorphic-inset)}

.card-wrapper{display:flex;flex-direction:column}
.card-badge{font-size:1.3rem;font-weight:600;color:var(--muted-foreground);font-family:var(--font-heading);margin-bottom:0;padding-left:0.15rem;line-height:1.2}
.card-badge::before{content:'· ';opacity:0.5}
.font-actions{display:flex;gap:0.25rem;align-self:flex-end}

.btn-icon{display:flex;align-items:center;justify-content:center;width:2rem;height:2rem;border-radius:0.5rem;border:1px solid var(--border);background:var(--card);color:var(--muted-foreground);cursor:pointer;font-size:0.9rem;transition:all var(--transition-fast);box-shadow:var(--shadow-neumorphic)}
.btn-icon:hover{background:var(--muted);color:var(--foreground);border-color:var(--accent);box-shadow:var(--shadow-neumorphic-inset)}
.btn-icon.faved{color:#d4d4f7;border-color:var(--accent);background:var(--accent)}.dark .btn-icon.faved{color:var(--accent-foreground);border-color:var(--accent);background:var(--accent)}

.btn-copy{background:var(--accent);color:var(--accent-foreground);border-color:var(--accent);font-size:0.75rem;font-weight:600;padding:0.35rem 0.75rem;border-radius:0.5rem;border:none;cursor:pointer;transition:all var(--transition-fast);white-space:nowrap;box-shadow:var(--shadow-neumorphic)}
.btn-copy:hover{background:var(--brand-dark);transform:scale(1.03);box-shadow:var(--shadow-card-hover)}
.btn-copy.copied{background:#22c55e}

.font-grid-empty{grid-column:1/-1;text-align:center;padding:3rem 1rem;color:var(--muted-foreground);font-size:1rem}
.font-grid-empty .empty-icon{font-size:3rem;margin-bottom:1rem;display:block}

.font-card.highlight{border-color:var(--accent);box-shadow:0 0 0 3px var(--ring);animation:card-pulse 2s ease-in-out}
@keyframes card-pulse{0%,100%{box-shadow:0 0 0 3px var(--ring)}50%{box-shadow:0 0 0 10px transparent}}

/* ===== TOAST ===== */
.toast{position:fixed;bottom:2rem;left:50%;transform:translateX(-50%)translateY(100px);background:var(--card);color:var(--foreground);border:1px solid var(--border);padding:0.75rem 1.5rem;border-radius:100px;font-size:0.9rem;font-weight:600;box-shadow:var(--shadow-card-hover);z-index:9999;opacity:0;transition:all .3s cubic-bezier(.68,-.55,.265,1.55);pointer-events:none}
.toast.show{opacity:1;transform:translateX(-50%)translateY(0)}
.toast.success{border-color:#22c55e;color:#166534}.dark .toast.success{color:#86efac}
.toast.error{border-color:#ef4444;color:#991b1b}.dark .toast.error{color:#fca5a5}

/* ===== SHARE MODAL ===== */
.modal-overlay{position:fixed;inset:0;z-index:9998;background:rgba(0,0,0,0.5);backdrop-filter:blur(4px);display:flex;align-items:center;justify-content:center;opacity:0;pointer-events:none;transition:opacity var(--transition-normal)}
.modal-overlay.active{opacity:1;pointer-events:auto}
.modal-dialog{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:1.5rem;max-width:420px;width:90%;box-shadow:var(--shadow-card-hover);text-align:center}
.modal-dialog h3{margin:0 0 0.5rem;font-size:1.1rem;color:var(--foreground);font-family:var(--font-heading)}
.modal-dialog .preview-text{background:var(--muted);padding:0.75rem;border-radius:0.5rem;font-size:0.9rem;color:var(--foreground);word-break:break-all;margin-bottom:1rem;max-height:200px;overflow-y:auto}
.share-btn-group{display:flex;justify-content:space-evenly;flex-wrap:nowrap}
.share-btn-social{display:flex;flex-direction:column;align-items:center;gap:0.35rem;padding:0.5rem 0.6rem;border:none;background:transparent;color:var(--muted-foreground);cursor:pointer;font-size:0.7rem;font-weight:600;transition:all var(--transition-fast);min-width:64px}
.share-btn-social:hover{color:var(--foreground)}
.share-btn-icon{width:3rem;height:3rem;border-radius:50%;background:var(--muted);display:flex;align-items:center;justify-content:center;margin-bottom:0.1rem}
.modal-close{margin-top:1rem;padding:0.5rem 1.5rem;border-radius:100px;border:1px solid var(--border);background:var(--muted);color:var(--muted-foreground);cursor:pointer;font-size:0.85rem;font-weight:600;transition:all var(--transition-fast)}
.modal-close:hover{background:var(--border);color:var(--foreground)}

/* ===== SCROLL TO TOP ===== */
.scroll-top-btn{position:fixed;bottom:2rem;right:1.5rem;z-index:50;width:2.75rem;height:2.75rem;border-radius:50%;border:1px solid var(--border);background:var(--card);color:var(--foreground);cursor:pointer;font-size:1.2rem;box-shadow:var(--shadow-neumorphic);display:flex;align-items:center;justify-content:center;opacity:0;pointer-events:none;transition:all var(--transition-fast)}
.scroll-top-btn.visible{opacity:1;pointer-events:auto}
.scroll-top-btn:hover{background:var(--accent);color:var(--accent-foreground);border-color:var(--accent);box-shadow:var(--shadow-card-hover)}

/* ===== SHARE BAR ===== */
.share-btn{width:44px;height:44px;border-radius:50%;border:1px solid var(--border);background:var(--card);color:var(--muted-foreground);cursor:pointer;display:flex;align-items:center;justify-content:center;font-size:1rem;transition:all var(--transition-fast);box-shadow:var(--shadow-neumorphic)}
.share-btn:hover{background:var(--accent);color:var(--accent-foreground);border-color:var(--accent)}
.share-toast{position:fixed;bottom:2rem;left:50%;transform:translateX(-50%)translateY(100px);background:var(--card);color:var(--foreground);border:1px solid var(--border);padding:0.75rem 1.5rem;border-radius:100px;font-size:0.9rem;font-weight:600;box-shadow:var(--shadow-card-hover);z-index:9999;opacity:0;transition:all .3s cubic-bezier(.68,-.55,.265,1.55);pointer-events:none}
.share-toast.show{opacity:1;transform:translateX(-50%)translateY(0)}

/* ===== COLLAPSIBLE NAV ===== */
.tool-card{background:var(--card);border:1px solid var(--border);box-shadow:var(--shadow-neumorphic);border-radius:var(--radius)}
.collapse-trigger{cursor:pointer;user-select:none}
.collapse-nav{max-height:0;overflow:hidden;transition:max-height .35s ease}
.collapse-nav.open{max-height:600px}
.collapse-arrow{transition:transform .3s ease}.collapse-arrow.open{transform:rotate(180deg)}

/* ===== FAQ ===== */
.faq-item{cursor:pointer;padding:1rem;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);transition:all var(--transition-fast);box-shadow:var(--shadow-neumorphic)}
.faq-item:hover{border-color:var(--accent)}
.faq-answer{max-height:0;overflow:hidden;transition:max-height .35s ease}
.faq-icon{transition:transform .3s ease;flex-shrink:0}

/* ===== SEO / FEATURES ===== */
.seo-section{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:2rem;margin:2rem 0;box-shadow:var(--shadow-neumorphic)}
.seo-section h2{font-family:var(--font-heading);font-size:1.5rem;font-weight:700;color:var(--foreground);margin-top:0}
.seo-section h3{font-size:1.15rem;font-weight:600;color:var(--foreground);margin:1.5rem 0 0.5rem}
.seo-section p{font-size:0.95rem;line-height:1.7;color:var(--muted-foreground)}
.feature-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:1.5rem;margin:1.5rem 0}
.feature-item{background:var(--muted);padding:1.25rem;border-radius:var(--radius);border:1px solid var(--border);box-shadow:var(--shadow-neumorphic-inset)}
.feature-item h4{font-size:1rem;font-weight:600;color:var(--foreground);margin:0 0 0.5rem;font-family:var(--font-heading)}
.feature-item p{font-size:0.85rem;color:var(--muted-foreground);margin:0}

/* ===== TEAM CARD ===== */
.team-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:2rem;display:flex;flex-direction:column;align-items:center;gap:1.5rem;box-shadow:var(--shadow-neumorphic)}
@media(min-width:768px){.team-card{flex-direction:row;text-align:left}}
.team-avatar{width:5rem;height:5rem;border-radius:50%;overflow:hidden;flex-shrink:0;border:2px solid var(--accent)}

/* ===== FOOTER ===== */
.site-footer{position:relative;z-index:10;background:var(--card);border-top:1px solid var(--border);padding:1.5rem 1rem;margin-top:auto}
.footer-inner{display:flex;flex-direction:column;align-items:center;gap:0.75rem;max-width:72rem;margin:0 auto}
@media(min-width:768px){.footer-inner{flex-direction:row;justify-content:space-between}}
.footer-brand{font-size:1.25rem;font-weight:700;color:var(--brand);font-family:var(--font-heading)}
.footer-copy{font-size:0.85rem;color:var(--muted-foreground)}
.footer-email{font-size:0.85rem;color:var(--muted-foreground);text-decoration:none;transition:color var(--transition-fast)}
.footer-email:hover{color:var(--accent)}

/* ===== RESPONSIVE ===== */
@media(max-width:640px){
    .hero-section{padding:2.5rem 1rem 1.5rem}
    .font-gen-container{padding:0 0.5rem}
    .font-grid{gap:0.5rem}
    .control-actions{flex-direction:column;align-items:center}
    #toggleGroup{justify-content:center}
    .search-wrapper{width:100%}
    .search-wrapper .font-search{width:100%}
    .seo-section{padding:1.25rem}
    .feature-grid{grid-template-columns:1fr}
}

/* ===== UTILITIES + LEGACY SUPPORT ===== */
.text-center{text-align:center}.w-full{width:100%}.max-w-4xl{max-width:56rem}.max-w-3xl{max-width:48rem}.max-w-7xl{max-width:72rem}
.mx-auto{margin-left:auto;margin-right:auto}.relative{position:relative}
.flex{display:flex}.flex-col{flex-direction:column}.items-center{align-items:center}.justify-center{justify-content:center}.justify-between{justify-content:space-between}
.gap-sm{gap:0.5rem}.gap-md{gap:1rem}.gap-lg{gap:1.5rem}
.py-lg{padding-top:1.5rem;padding-bottom:1.5rem}.py-20{padding-top:5rem;padding-bottom:5rem}.py-12{padding-top:3rem;padding-bottom:3rem}
.pt-2{padding-top:0.5rem}.pt-4{padding-top:1rem}.mt-1{margin-top:0.25rem}.mt-4{margin-top:1rem}.mt-8{margin-top:2rem}.mt-16{margin-top:4rem}
.mb-3{margin-bottom:0.75rem}.mb-4{margin-bottom:1rem}.mb-6{margin-bottom:1.5rem}.mb-8{margin-bottom:2rem}.mb-16{margin-bottom:4rem}
.space-y-2>*+*{margin-top:0.5rem}.space-y-4{display:flex;flex-direction:column;gap:1rem}.space-y-8>*+*{margin-top:2rem}.space-x-8>*+*{margin-left:2rem}
.list-none{list-style:none;padding:0;margin:0}.list-disc{list-style:disc}.pl-8{padding-left:2rem}.pl-lg{padding-left:1.5rem}
.no-underline{text-decoration:none}.transition-colors{transition:color var(--transition-fast)}.transition-all{transition:all var(--transition-fast)}.duration-200{transition-duration:.2s}.duration-300{transition-duration:.3s}
.font-bold{font-weight:700}.font-semibold{font-weight:600}.font-medium{font-weight:500}
.text-sm{font-size:.875rem}.text-lg{font-size:1.125rem}.text-xl{font-size:1.25rem}.text-2xl{font-size:1.5rem}.text-3xl{font-size:1.875rem}.text-4xl{font-size:2.25rem}.text-5xl{font-size:3rem}
.tracking-tight{letter-spacing:-0.025em}.leading-relaxed{line-height:1.625}
.rounded-xl{border-radius:.75rem}.rounded-lg{border-radius:.5rem}.rounded-full{border-radius:9999px}
.overflow-hidden{overflow:hidden}.hidden{display:none}.block{display:block}.inline-flex{display:inline-flex}
.p-4{padding:1rem}.p-md{padding:1rem}.p-lg{padding:1.5rem}.p-8{padding:2rem}.p-0{padding:0}.m-0{margin:0}
.cursor-pointer{cursor:pointer}.flex-shrink-0{flex-shrink:0}.whitespace-nowrap{white-space:nowrap}.select-none{user-select:none}.pointer-events-none{pointer-events:none}
.z-10{z-index:10}.z-40{z-index:40}.z-50{z-index:50}

/* Legacy color passthrough */
.text-purple-900,.text-purple-600,.text-purple-500,.text-purple-400,.text-purple-300,.text-gray-700,.text-gray-600,.text-gray-500,.text-gray-400,.text-gray-200,.text-white\/70,.text-white\/80,.text-white\/60,.text-white\/50{color:var(--foreground)}
.hover\:text-purple-600:hover,.hover\:text-purple-700:hover,.hover\:text-purple-300:hover{color:var(--accent)}
.bg-purple-100{background:var(--muted)}.border-purple-200{border-color:var(--accent)}.border-t{border-top:1px solid var(--border)}.border-t.border-gray-200{border-color:var(--border)!important}.border-b{border-bottom:1px solid var(--border)}.border-border{border-color:var(--border)}.glow-box{box-shadow:var(--shadow-neumorphic)}
.tools-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:1rem}
.tool-item{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:1.25rem}
.tool-item h3{font-size:1.1rem;font-weight:700;margin:0 0 0.5rem;color:var(--foreground)}
.tool-desc{font-size:.875rem;line-height:1.5;color:var(--muted-foreground);margin:0;display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:2;overflow:hidden;min-height:2.625rem}

.material-symbols-outlined{font-family:'Material Symbols Outlined';font-weight:400;font-style:normal;font-size:24px;line-height:1;letter-spacing:normal;text-transform:none;display:inline-block;white-space:nowrap;word-wrap:normal;direction:ltr;-webkit-font-smoothing:antialiased}
.hero-header{padding-top:160px}
@media(max-width:640px){.hero-header{padding-top:80px}.hero-header h1{font-size:2.44rem;overflow:hidden}}
footer .gradient-text{background:linear-gradient(135deg,var(--brand)0%,var(--brand-light)50%,#a78bfa 100%);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}

/* ===== ACCESSIBILITY: Reduced Motion ===== */
@media(prefers-reduced-motion:reduce){
    *,*::before,*::after{animation-duration:0.001ms!important;animation-iteration-count:1!important;transition-duration:0.001ms!important;scroll-behavior:auto!important}
    .aurora-bg::before{animation:none!important;background-position:0% 50%!important}
    .floating-particles,.particle{animation:none!important;opacity:0!important}
}