/* ============================================
   Layout — Navbar, Pages, Grid, Responsive
   ============================================ */

/* --- Ambient Background --- */
.ambient-bg {
    position: fixed;
    inset: 0;
    z-index: -1;
    overflow: hidden;
    pointer-events: none;
}

.ambient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.15;
    will-change: transform;
}

[data-theme="light"] .ambient-orb {
    opacity: 0.08;
}

.ambient-orb-1 {
    width: 500px;
    height: 500px;
    background: var(--color-accent-1);
    top: -150px;
    left: 10%;
    animation: ambientFloat1 20s ease-in-out infinite;
}

.ambient-orb-2 {
    width: 400px;
    height: 400px;
    background: var(--color-accent-2);
    bottom: -100px;
    right: 10%;
    animation: ambientFloat2 25s ease-in-out infinite;
}

.ambient-orb-3 {
    width: 350px;
    height: 350px;
    background: var(--color-accent-3);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation: ambientFloat3 18s ease-in-out infinite;
}

@keyframes ambientFloat1 {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(60px, 40px) scale(1.1); }
    66% { transform: translate(-30px, 60px) scale(0.95); }
}

@keyframes ambientFloat2 {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(-50px, -30px) scale(1.05); }
    66% { transform: translate(40px, -50px) scale(0.9); }
}

@keyframes ambientFloat3 {
    0%, 100% { transform: translate(-50%, -50%) scale(1); }
    50% { transform: translate(-50%, -50%) scale(1.15); }
}

/* --- Navbar --- */
.navbar {
    position: sticky;
    top: 0;
    z-index: var(--z-nav);
    display: flex;
    align-items: center;
    gap: var(--space-4);
    padding: var(--space-3) var(--space-6);
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border-bottom: 1px solid var(--glass-border);
    transition: var(--transition-colors);
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    flex-shrink: 0;
    font-weight: 800;
    font-size: var(--text-xl);
    letter-spacing: var(--tracking-tight);
    transition: opacity var(--duration-fast) ease;
}

.nav-logo:hover {
    opacity: 0.8;
}

.logo-icon {
    font-size: 1.4em;
    line-height: 1;
}

.logo-accent {
    background: var(--color-accent-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-search {
    flex: 1;
    max-width: 440px;
    margin: 0 auto;
    position: relative;
    display: flex;
    align-items: center;
}

.nav-search-icon {
    position: absolute;
    left: var(--space-3);
    color: var(--color-text-tertiary);
    pointer-events: none;
}

.nav-search input {
    width: 100%;
    padding: var(--space-2) var(--space-10);
    background: var(--color-bg-input);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    font-size: var(--text-sm);
    color: var(--color-text-primary);
    transition: var(--transition-all);
}

.nav-search input::placeholder {
    color: var(--color-text-muted);
}

.nav-search input:hover {
    background: var(--color-bg-input-hover);
    border-color: var(--color-border-hover);
}

.nav-search input:focus {
    background: var(--color-bg-input-focus);
    border-color: var(--color-border-focus);
    box-shadow: var(--shadow-glow);
}

.nav-search-kbd {
    position: absolute;
    right: var(--space-3);
    padding: 2px 6px;
    font-size: var(--text-xs);
    font-family: var(--font-sans);
    color: var(--color-text-muted);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xs);
    pointer-events: none;
    line-height: 1.4;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    flex-shrink: 0;
}

.nav-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    transition: var(--transition-all);
}

.nav-btn:hover {
    color: var(--color-text-primary);
    background: var(--color-bg-card-hover);
}

/* Theme toggle icon visibility */
[data-theme="dark"] .theme-icon-dark { display: block; }
[data-theme="dark"] .theme-icon-light { display: none; }
[data-theme="light"] .theme-icon-dark { display: none; }
[data-theme="light"] .theme-icon-light { display: block; }

/* --- Hero Section --- */
.hero {
    text-align: center;
    padding: var(--space-16) var(--space-6) var(--space-10);
    position: relative;
}

.hero-title {
    font-size: var(--text-5xl);
    font-weight: 900;
    letter-spacing: -0.03em;
    margin-bottom: var(--space-4);
    animation: heroIn 0.7s var(--ease-out) both;
}

.hero-badge {
    display: inline-block;
    margin-left: var(--space-3);
    padding: var(--space-1) var(--space-3);
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-accent-1);
    background: var(--color-accent-glow);
    border: 1px solid rgba(108, 99, 255, 0.2);
    border-radius: var(--radius-full);
    vertical-align: middle;
    animation: badgePulse 3s ease-in-out infinite;
}

.hero-subtitle {
    font-size: var(--text-lg);
    color: var(--color-text-secondary);
    max-width: 560px;
    margin: 0 auto;
    animation: heroIn 0.7s var(--ease-out) 0.1s both;
}

@keyframes heroIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes badgePulse {
    0%, 100% { box-shadow: 0 0 0 0 rgba(108, 99, 255, 0.15); }
    50% { box-shadow: 0 0 0 8px rgba(108, 99, 255, 0); }
}

/* --- Category Filters --- */
.category-filters {
    display: flex;
    justify-content: center;
    gap: var(--space-2);
    padding: 0 var(--space-6);
    margin-bottom: var(--space-8);
    flex-wrap: wrap;
    animation: heroIn 0.7s var(--ease-out) 0.2s both;
}

.category-btn {
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    transition: var(--transition-all);
    white-space: nowrap;
}

.category-btn:hover {
    color: var(--color-text-primary);
    background: var(--color-bg-card-hover);
    border-color: var(--color-border-hover);
}

.category-btn.active {
    color: white;
    background: var(--color-accent-gradient);
    border-color: transparent;
    box-shadow: var(--shadow-glow);
}

/* --- Tool Grid --- */
.tool-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--space-5);
    padding: 0 var(--space-6);
    max-width: var(--container-max);
    margin: 0 auto var(--space-16);
}

/* --- Tool Card --- */
.tool-card {
    display: flex;
    flex-direction: column;
    padding: var(--space-6);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
    transition: var(--transition-all);
    cursor: pointer;
    position: relative;
    overflow: hidden;
    animation: cardIn 0.5s var(--ease-out) both;
}

.tool-card::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    background: var(--color-accent-gradient);
    opacity: 0;
    transition: opacity var(--duration-slow) var(--ease-in-out);
    z-index: -1;
}

.tool-card:hover {
    transform: translateY(-4px);
    border-color: var(--color-border-hover);
    box-shadow: var(--shadow-card-hover);
}

.tool-card:hover::before {
    opacity: 0.04;
}

.tool-card:active {
    transform: translateY(-2px);
}

.tool-card-icon {
    font-size: 2rem;
    margin-bottom: var(--space-3);
    line-height: 1;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border-subtle);
}

.tool-card-name {
    font-size: var(--text-lg);
    font-weight: 600;
    margin-bottom: var(--space-1);
    color: var(--color-text-primary);
}

.tool-card-desc {
    font-size: var(--text-sm);
    color: var(--color-text-tertiary);
    line-height: var(--leading-relaxed);
    flex: 1;
    margin-bottom: var(--space-4);
}

.tool-card-badge {
    display: inline-flex;
    align-self: flex-start;
    padding: 2px var(--space-3);
    font-size: var(--text-xs);
    font-weight: 500;
    border-radius: var(--radius-full);
    letter-spacing: var(--tracking-wide);
    text-transform: uppercase;
}

.badge-image { color: var(--color-cat-image); background: var(--color-cat-image-bg); }
.badge-text { color: var(--color-cat-text); background: var(--color-cat-text-bg); }
.badge-developer { color: var(--color-cat-developer); background: var(--color-cat-developer-bg); }
.badge-converter { color: var(--color-cat-converter); background: var(--color-cat-converter-bg); }

@keyframes cardIn {
    from { opacity: 0; transform: translateY(16px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Stagger card animations */
.tool-card:nth-child(1)  { animation-delay: 0.04s; }
.tool-card:nth-child(2)  { animation-delay: 0.08s; }
.tool-card:nth-child(3)  { animation-delay: 0.12s; }
.tool-card:nth-child(4)  { animation-delay: 0.16s; }
.tool-card:nth-child(5)  { animation-delay: 0.20s; }
.tool-card:nth-child(6)  { animation-delay: 0.24s; }
.tool-card:nth-child(7)  { animation-delay: 0.28s; }
.tool-card:nth-child(8)  { animation-delay: 0.32s; }
.tool-card:nth-child(9)  { animation-delay: 0.36s; }
.tool-card:nth-child(10) { animation-delay: 0.40s; }
.tool-card:nth-child(11) { animation-delay: 0.44s; }
.tool-card:nth-child(12) { animation-delay: 0.48s; }
.tool-card:nth-child(13) { animation-delay: 0.52s; }
.tool-card:nth-child(14) { animation-delay: 0.56s; }
.tool-card:nth-child(15) { animation-delay: 0.60s; }
.tool-card:nth-child(16) { animation-delay: 0.64s; }
.tool-card:nth-child(17) { animation-delay: 0.68s; }
.tool-card:nth-child(18) { animation-delay: 0.72s; }
.tool-card:nth-child(19) { animation-delay: 0.76s; }
.tool-card:nth-child(20) { animation-delay: 0.80s; }

/* --- Tool Page --- */
.tool-page {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: var(--space-8) var(--space-6) var(--space-16);
    animation: pageIn 0.4s var(--ease-out) both;
}

@keyframes pageIn {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

.tool-page-header {
    margin-bottom: var(--space-8);
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-text-tertiary);
    margin-bottom: var(--space-5);
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-md);
    transition: var(--transition-all);
}

.back-link:hover {
    color: var(--color-text-primary);
    background: var(--color-bg-card);
}

.back-link svg {
    width: 16px;
    height: 16px;
    transition: transform var(--duration-fast) ease;
}

.back-link:hover svg {
    transform: translateX(-3px);
}

.tool-page-title {
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

.tool-page-icon {
    font-size: 2.2rem;
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    flex-shrink: 0;
}

.tool-page-title h1 {
    font-size: var(--text-3xl);
    margin-bottom: var(--space-1);
}

.tool-page-title p {
    font-size: var(--text-base);
    color: var(--color-text-tertiary);
}

.tool-page-body {
    position: relative;
}

/* --- Footer --- */
.footer {
    padding: var(--space-10) var(--space-6);
    text-align: center;
    border-top: 1px solid var(--color-border-subtle);
}

.footer-text {
    font-size: var(--text-base);
    font-weight: 500;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-1);
}

.footer-heart {
    display: inline-block;
    animation: heartBeat 1.5s ease-in-out infinite;
}

@keyframes heartBeat {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.15); }
}

.footer-sub {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
}

/* --- Home Container --- */
.home {
    min-height: 60vh;
}

/* --- No Results --- */
.no-results {
    grid-column: 1 / -1;
    text-align: center;
    padding: var(--space-16) var(--space-6);
    color: var(--color-text-tertiary);
}

.no-results-icon {
    font-size: 3rem;
    margin-bottom: var(--space-4);
    opacity: 0.5;
}

.no-results-text {
    font-size: var(--text-lg);
    font-weight: 500;
}

/* ============================================
   Responsive Breakpoints
   ============================================ */

@media (max-width: 1024px) {
    .tool-grid {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
        gap: var(--space-4);
    }

    .hero-title {
        font-size: var(--text-4xl);
    }
}

@media (max-width: 768px) {
    .navbar {
        padding: var(--space-3) var(--space-4);
    }

    .nav-search {
        max-width: none;
        flex: 1;
    }

    .nav-search-kbd {
        display: none;
    }

    .hero {
        padding: var(--space-10) var(--space-4) var(--space-8);
    }

    .hero-title {
        font-size: var(--text-3xl);
    }

    .hero-badge {
        display: block;
        margin: var(--space-3) auto 0;
        width: fit-content;
    }

    .hero-subtitle {
        font-size: var(--text-base);
    }

    .category-filters {
        padding: 0 var(--space-4);
        gap: var(--space-2);
        flex-wrap: nowrap;
        overflow-x: auto;
        justify-content: flex-start;
        -webkit-overflow-scrolling: touch;
        padding-bottom: var(--space-2); /* For scrollbar */
    }

    .category-filters::-webkit-scrollbar {
        display: none;
    }

    .category-btn {
        padding: var(--space-2) var(--space-4);
        font-size: var(--text-sm);
        flex-shrink: 0;
    }

    .tool-grid {
        grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
        padding: 0 var(--space-4);
        gap: var(--space-3);
    }

    .tool-card {
        padding: var(--space-5);
    }

    .tool-page {
        padding: var(--space-5) var(--space-4) var(--space-12);
    }

    .tool-page-title h1 {
        font-size: var(--text-2xl);
    }

    /* Stack split layouts */
    .tool-split {
        flex-direction: column !important;
    }
}

@media (max-width: 480px) {
    .logo-text {
        display: none;
    }

    .hero-title {
        font-size: var(--text-2xl);
    }

    .tool-grid {
        grid-template-columns: 1fr;
    }

    .tool-page-title {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-3);
    }
    
    .tool-actions-right {
        flex-direction: column;
        width: 100%;
    }
    
    .tool-actions-right .btn {
        width: 100%;
    }
}