/* ───────────────────────────────────────────────
   1. Design Tokens
   ─────────────────────────────────────────────── */
:root {
    --bg: #0a0a0b;
    --bg-elevated: #111113;
    --surface: #161618;
    --surface-hover: #1c1c1f;
    --surface-active: #222226;
    --border: #242429;
    --border-hover: #333338;
    --text: #f1f1f3;
    --text-secondary: #9a9aa3;
    --text-tertiary: #63636c;
    --accent: #fafafa;
    --accent-dim: #d4d4d8;
    --glow-subtle: rgba(255, 255, 255, 0.025);
    --glow-card: rgba(255, 255, 255, 0.04);
    --shadow-card: 0 1px 2px rgba(0, 0, 0, 0.3), 0 0 0 1px rgba(255, 255, 255, 0.03);
    --shadow-card-hover: 0 2px 12px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(255, 255, 255, 0.08),
        0 0 40px rgba(255, 255, 255, 0.015);
    --shadow-modal: 0 0 0 1px rgba(255, 255, 255, 0.06), 0 4px 24px rgba(0, 0, 0, 0.3),
        0 0 60px rgba(255, 255, 255, 0.02);
    --radius-sm: 6px;
    --radius: 10px;
    --radius-lg: 14px;
    --radius-xl: 18px;
    --radius-2xl: 22px;
    --transition: 0.28s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: 0.16s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ───────────────────────────────────────────────
   2. Reset & Base
   ─────────────────────────────────────────────── */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
html {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    background: var(--bg);
}
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    line-height: 1.55;
    letter-spacing: -0.008em;
    font-size: 14px;
    display: flex;
    flex-direction: column;
}

/* 全局微光背景 */
body::before {
    content: '';
    position: fixed;
    top: -40%;
    left: -25%;
    width: 70%;
    height: 80%;
    background: radial-gradient(ellipse at center, rgba(255, 255, 255, 0.012) 0%, transparent 70%);
    pointer-events: none;
    z-index: 0;
}
body::after {
    content: '';
    position: fixed;
    bottom: -30%;
    right: -20%;
    width: 55%;
    height: 65%;
    background: radial-gradient(ellipse at center, rgba(255, 255, 255, 0.008) 0%, transparent 70%);
    pointer-events: none;
    z-index: 0;
}

/* ───────────────────────────────────────────────
   3. Layout — Navbar
   ─────────────────────────────────────────────── */
.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(10, 10, 11, 0.72);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid transparent;
    padding: 0 1.5rem;
    transition: border-color 0.4s ease, background 0.4s ease;
}
.navbar.scrolled {
    border-bottom-color: var(--border);
    background: rgba(10, 10, 11, 0.88);
}
.navbar-inner {
    max-width: 1120px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 48px;
}
.nav-brand {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 400;
    font-size: 1.25rem;
    letter-spacing: -0.015em;
    color: var(--text);
    text-decoration: none;
    cursor: pointer;
    transition: color 0.5s, text-shadow 0.5s;
}
.nav-brand:hover {
    color: #fff;
    text-shadow: 0 0 4px #fff,
                 0 0 8px #fff,
                 0 0 16px #fff,
                 0 0 32px #fff;
}
.nav-brand:hover .nav-icon {
    filter: drop-shadow(0 0 8px #fff);
}
.nav-dot {
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: var(--accent);
    flex-shrink: 0;
    box-shadow: 0 0 8px rgba(255, 255, 255, 0.35);
}
.nav-links {
    display: flex;
    align-items: center;
    gap: 18px;
}
.nav-icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    margin-left: -8px;
}
.nav-link {
    font-size: 0.8rem;
    font-weight: 450;
    letter-spacing: -0.005em;
    color: var(--text-secondary);
    text-decoration: none;
    cursor: pointer;
    transition: color 0.2s ease;
    background: transparent;
    border: none;
    padding: 0;
    line-height: 1;
    position: relative;
    display: inline-flex;
    align-items: center;
}
.nav-link::after {
    content: '';
    position: absolute;
    bottom: -3px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--text);
    transition: width 0.25s ease;
}
.nav-link:hover {
    color: var(--text);
}
.nav-link:hover::after {
    width: 100%;
}
.nav-donate-icon {
    width: 14px;
    height: 14px;
    vertical-align: middle;
    margin-right: 3px;
}

/* ───────────────────────────────────────────────
   4. Layout — Main & Page Header
   ─────────────────────────────────────────────── */
.main-container {
    max-width: 1120px;
    width: 100%;
    margin: 0 auto;
    padding: 2.8rem 1.5rem 3rem;
    position: relative;
    z-index: 1;
    flex: 1;
}
.page-header {
    margin-bottom: 2.8rem;
}
.page-eyebrow {
    display: inline-block;
    font-size: 0.64rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-tertiary);
    margin-bottom: 0.55rem;
}
.page-header h1 {
    font-size: 3.6rem;
    font-weight: 700;
    letter-spacing: -0.04em;
    margin-bottom: 0.35rem;
    color: var(--text);
}
.page-header p {
    font-size: 0.82rem;
    color: var(--text-secondary);
    max-width: 430px;
    line-height: 1.65;
}

/* ───────────────────────────────────────────────
   5. Components — Card Grid & Project Card
   ─────────────────────────────────────────────── */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(310px, 1fr));
    gap: 0.7rem;
}
.project-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.15rem 1.2rem 1.05rem;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 0.55rem;
    box-shadow: var(--shadow-card);
    -webkit-tap-highlight-color: transparent;
    user-select: none;
    outline: none;
    overflow: hidden;
}
.project-card::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    opacity: 0;
    transition: opacity 0.4s ease;
    background: radial-gradient(ellipse at 50% 0%, rgba(255, 255, 255, 0.025) 0%, transparent 65%);
    pointer-events: none;
    z-index: 0;
}
.project-card:hover {
    border-color: var(--border-hover);
    box-shadow: var(--shadow-card-hover);
    transform: translateY(-1px);
    background: var(--surface-hover);
}
.project-card:hover::before {
    opacity: 1;
}
.project-card:active {
    transform: translateY(0);
    box-shadow: var(--shadow-card);
    transition: 0.06s ease;
    background: var(--surface-active);
}
.card-top {
    display: flex;
    align-items: flex-start;
    gap: 11px;
    position: relative;
    z-index: 1;
}
.card-icon {
    width: 38px;
    height: 38px;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    flex-shrink: 0;
    background: #1e1e22;
    transition: var(--transition-fast);
    line-height: 1;
    border: 1px solid #2a2a30;
    overflow: hidden;
    padding: 4px;
}
.card-icon img {
    width: 100%;
    height: 100%;
    object-fit: contain !important;
    border-radius: 2px;
    display: block;
}
.project-card:hover .card-icon {
    background: #25252b;
    border-color: #3a3a42;
}
.card-info {
    flex: 1;
    min-width: 0;
}
.card-info h3 {
    font-size: 0.88rem;
    font-weight: 570;
    letter-spacing: -0.02em;
    margin-bottom: 2px;
    line-height: 1.3;
    color: var(--text);
}
.card-info p {
    font-size: 0.74rem;
    color: var(--text-secondary);
    line-height: 1.45;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.card-footer {
    display: flex;
    align-items: center;
    gap: 7px;
    margin-top: auto;
    padding-top: 0.1rem;
    font-size: 0.64rem;
    color: var(--text-tertiary);
    position: relative;
    z-index: 1;
}
.card-views {
    padding: 2px 7px;
    border-radius: 3px;
    font-size: 0.62rem;
    font-weight: 480;
    letter-spacing: 0.01em;
    background: #1c1c20;
    color: var(--text-tertiary);
    border: 1px solid #26262c;
    display: inline-flex;
    align-items: center;
    gap: 4px;
}
.card-views .iconfont {
    font-size: 0.7rem;
}
.card-tag {
    padding: 2px 7px;
    border-radius: 3px;
    font-size: 0.62rem;
    font-weight: 480;
    letter-spacing: 0.01em;
    background: #1c1c20;
    color: var(--text-tertiary);
    border: 1px solid #26262c;
    display: inline-flex;
    align-items: center;
    gap: 4px;
}
.card-tag .iconfont {
    font-size: 0.7rem;
}
.card-arrow {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 3px;
    opacity: 0;
    transform: translateX(-3px);
    transition: var(--transition);
    color: var(--text-secondary);
    font-size: 0.66rem;
    white-space: nowrap;
    font-weight: 460;
}
.project-card:hover .card-arrow {
    opacity: 1;
    transform: translateX(0);
}
.card-arrow svg {
    width: 11px;
    height: 11px;
}

/* ───────────────────────────────────────────────
   6. Components — Project Preview Modal (iframe)
   ─────────────────────────────────────────────── */
.modal-overlay {
    position: fixed;
    inset: 0;
    z-index: 999;
    background: rgba(0, 0, 0, 0.72);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.4rem;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}
.modal-overlay.active {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}
.modal-overlay.minimized {
    visibility: visible;
    opacity: 1;
    background: transparent;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    pointer-events: none;
    transition: none;
}
.modal-overlay.minimized .modal-dialog {
    position: fixed;
    top: -200vh;
    left: -200vw;
    pointer-events: none;
    transition: none;
}
.modal-dialog {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 6px;
    width: 100%;
    max-width: 1050px;
    height: 90vh;
    max-height: 94vh;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-modal);
    transform: translateY(16px) scale(0.968);
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}
.modal-overlay.active .modal-dialog {
    transform: translateY(0) scale(1);
}

/* Toolbar */
.modal-toolbar {
    display: flex;
    align-items: center;
    gap: 9px;
    padding: 0.45rem 0.7rem;
    background: #121215;
    border-bottom: 1px solid #1f1f25;
    border-radius: 6px 6px 0 0;
    flex-shrink: 0;
}
.toolbar-dots {
    display: flex;
    gap: 5px;
    flex-shrink: 0;
}
.toolbar-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    opacity: 0.7;
}
.dot-red { background: #ee5f5f; }
.dot-yellow { background: #f0b94b; }
.dot-green { background: #55c460; }

.address-bar {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 6px;
    background: #1a1a1e;
    border: 1px solid #28282f;
    border-radius: 6px;
    padding: 5px 10px;
    font-size: 0.68rem;
    color: var(--text-tertiary);
    min-width: 0;
    transition: var(--transition-fast);
}
.address-refresh-btn {
    margin-left: auto;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    border: none;
    cursor: pointer;
    background: transparent;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #6a6a74;
    flex-shrink: 0;
    font-size: 0.55rem;
    transition: 0.16s cubic-bezier(0.4, 0, 0.2, 1);
    padding: 0;
    line-height: 1;
}
.address-refresh-btn:hover {
    color: #fff;
    text-shadow: 0 0 4px #fff, 0 0 10px #fff;
}
.address-bar .lock-icon {
    flex-shrink: 0;
    font-size: 0.55rem;
    opacity: 0.35;
    transition: opacity 0.2s ease, color 0.2s ease, text-shadow 0.2s ease;
}
.address-bar .lock-icon:hover {
    color: #fff;
    opacity: 0.7;
    text-shadow: 0 0 4px #fff, 0 0 10px #fff;
}
.address-bar span {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    color: #c0c0c8;
    font-weight: 400;
    font-size: 0.68rem;
}
.modal-actions {
    display: flex;
    gap: 2px;
    flex-shrink: 0;
}
.modal-action-btn {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    border: none;
    cursor: pointer;
    background: transparent;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #6a6a74;
    transition: var(--transition-fast);
    font-size: 0.55rem;
}
.modal-action-btn:hover {
    color: #fff;
    text-shadow: 0 0 4px #fff, 0 0 10px #fff;
}
.modal-action-btn.close-btn:hover {
    color: #ee6b6b;
    text-shadow: 0 0 4px #ee6b6b, 0 0 10px #ee6b6b;
}
.modal-action-btn .iconfont,
.address-refresh-btn .iconfont,
.minimized-btn .iconfont,
.address-bar .lock-icon .iconfont {
    font-size: 0.72rem !important;
}

.minimized-bar {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 6px;
    padding: 0 16px 16px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(8px);
    transition: opacity 0.25s ease, visibility 0.25s ease, transform 0.25s ease;
    pointer-events: none;
}
.minimized-bar.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    pointer-events: auto;
}
.minimized-bar-item {
    display: flex;
    align-items: center;
    gap: 4px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 6px 8px 6px 12px;
    box-shadow: 0 2px 16px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(255, 255, 255, 0.04);
    animation: minItemIn 0.25s ease;
}
@keyframes minItemIn {
    from { opacity: 0; transform: translateY(6px); }
    to   { opacity: 1; transform: translateY(0); }
}
.minimized-bar-url {
    font-size: 0.72rem;
    color: var(--text-secondary);
    max-width: 320px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    line-height: 1;
}
.minimized-btn {
    width: 26px;
    height: 26px;
    border-radius: 50%;
    border: none;
    cursor: pointer;
    background: transparent;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #6a6a74;
    flex-shrink: 0;
    font-size: 0.55rem;
    transition: var(--transition-fast);
}
.minimized-btn:hover {
    color: #fff;
    text-shadow: 0 0 4px #fff, 0 0 10px #fff;
}
.minimized-btn.restored-btn:hover {
    color: #fff;
    text-shadow: 0 0 4px #fff, 0 0 10px #fff;
}
.minimized-btn.close-btn:hover {
    color: #ee6b6b;
    text-shadow: 0 0 4px #ee6b6b, 0 0 10px #ee6b6b;
}

[data-tip] {
    position: relative;
}
[data-tip]::after {
    content: attr(data-tip);
    position: absolute;
    bottom: calc(100% + 8px);
    left: 50%;
    transform: translateX(-50%);
    padding: 5px 10px;
    background: #2a2a30;
    color: #e0e0e8;
    font-size: 0.7rem;
    font-weight: 400;
    white-space: nowrap;
    border-radius: 4px;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.18s ease;
    z-index: 9999;
    border: 1px solid #3a3a42;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.5);
}
[data-tip]::before {
    content: '';
    position: absolute;
    bottom: calc(100% + 3px);
    left: 50%;
    transform: translateX(-50%);
    border: 5px solid transparent;
    border-top-color: #2a2a30;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.18s ease;
    z-index: 9999;
}
[data-tip]:hover::after,
[data-tip]:hover::before {
    opacity: 1;
}

/* Iframe area */
.modal-iframe-wrap {
    flex: 1;
    min-height: 0;
    position: relative;
    background: #0d0d0f;
    border-radius: 0 0 6px 6px;
    overflow: hidden;
}
.modal-iframe-wrap iframe {
    width: 100%;
    height: 100%;
    border: none;
    display: block;
    background: #fff;
}

/* Loader */
.iframe-loader {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #0d0d0f;
    pointer-events: none;
    transition: opacity 0.4s ease;
    z-index: 2;
}
.iframe-loader.hidden {
    opacity: 0;
    pointer-events: none;
}
.loader-ring {
    width: 26px;
    height: 26px;
    border-radius: 50%;
    border: 2.5px solid #1f1f25;
    border-top-color: #888;
    animation: spin 0.6s linear infinite;
}

/* Error state */
.iframe-error {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: #0d0d0f;
    color: #777;
    font-size: 0.76rem;
    gap: 5px;
    z-index: 3;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.3s ease;
    text-align: center;
    padding: 1rem;
}
.iframe-error.show {
    opacity: 1;
    pointer-events: auto;
}
.iframe-error .err-icon {
    font-size: 1.4rem;
    margin-bottom: 2px;
    opacity: 0.7;
}
.iframe-error .err-link {
    pointer-events: auto;
    cursor: pointer;
    color: #b0b0b8;
    text-decoration: underline;
    font-weight: 500;
    margin-top: 5px;
    font-size: 0.72rem;
    transition: color 0.2s;
}
.iframe-error .err-link:hover {
    color: #fff;
}

/* ───────────────────────────────────────────────
   7. Components — Content Modal (About / Contact)
   ─────────────────────────────────────────────── */
.content-modal-overlay {
    position: fixed;
    inset: 0;
    z-index: 1000;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.25s ease, visibility 0.25s ease;
}
.content-modal-overlay.active {
    opacity: 1;
    visibility: visible;
}
.content-modal-dialog {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    width: 100%;
    max-width: 480px;
    box-shadow: var(--shadow-modal);
    transform: translateY(12px) scale(0.97);
    transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    overflow: hidden;
}
.content-modal-overlay.active .content-modal-dialog {
    transform: translateY(0) scale(1);
}
.content-modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.9rem 1.2rem;
    border-bottom: 1px solid var(--border);
    gap: 1rem;
}
.content-modal-header h3 {
    font-size: 0.9rem;
    font-weight: 560;
    letter-spacing: -0.02em;
    color: var(--text);
    margin: 0;
    line-height: 1.2;
}
.content-modal-close {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    border: none;
    cursor: pointer;
    background: transparent;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #6a6a74;
    transition: var(--transition-fast);
    font-size: 1rem;
    flex-shrink: 0;
}
.content-modal-close:hover {
    background: #3a1a1a;
    color: #ee6b6b;
}
.content-modal-body {
    padding: 1.2rem;
    font-size: 0.82rem;
    color: var(--text-secondary);
    line-height: 1.7;
    max-height: 60vh;
    overflow-y: auto;
}
.content-modal-body p {
    margin-bottom: 0.8rem;
}
.content-modal-body a {
    color: var(--accent-dim);
    text-decoration: underline;
    transition: color 0.2s;
}
.content-modal-body a:hover {
    color: #fff;
}
.content-modal-body .tag-list {
    display: inline-flex;
    flex-wrap: wrap;
    gap: 6px;
    margin: 0 2px;
    vertical-align: middle;
}
.content-modal-body .tag-item {
    padding: 3px 9px;
    border-radius: 4px;
    font-size: 0.68rem;
    background: #1c1c20;
    color: var(--text-tertiary);
    border: 1px solid #26262c;
    white-space: nowrap;
}
.content-modal-body .contact-line {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 0.6rem;
}
.contact-line-icon {
    font-size: 1rem;
    opacity: 0.7;
}

/* ───────────────────────────────────────────────
   8. Layout — Footer
   ─────────────────────────────────────────────── */
.site-footer {
    position: relative;
    z-index: 1;
    width: 100%;
    border-top: 1px solid var(--border);
    background: var(--bg);
    padding: 1.2rem 1.5rem;
    margin-top: auto;
}
.footer-inner {
    max-width: 1120px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.5rem;
    font-size: 0.7rem;
    color: var(--text-tertiary);
    letter-spacing: 0.01em;
}
.footer-copyright {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    flex-wrap: wrap;
}
.footer-copyright span {
    white-space: nowrap;
}
.footer-copyright a {
    color: var(--text-tertiary);
    text-decoration: none;
    transition: color 0.2s;
    white-space: nowrap;
}
.footer-copyright a:hover {
    color: var(--text-secondary);
}
.footer-divider {
    width: 1px;
    height: 10px;
    background: var(--border);
    margin: 0 0.2rem;
}
.footer-beian {
    display: flex;
    align-items: center;
    gap: 0.3rem;
    white-space: nowrap;
}
.footer-beian a {
    color: var(--text-tertiary);
    text-decoration: none;
    transition: color 0.2s;
}
.footer-beian a:hover {
    color: var(--text-secondary);
}

/* ───────────────────────────────────────────────
   9. Decorative — 右下角装饰图
   ─────────────────────────────────────────────── */
.deco-corner {
    position: fixed;
    bottom: 0;
    z-index: 0;
    width: 600px;
    height: auto;
    opacity: 0.45;
    pointer-events: none;
    user-select: none;
    right: -80px;
}

/* ───────────────────────────────────────────────
   10. Keyframes
   ─────────────────────────────────────────────── */
@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ───────────────────────────────────────────────
   11. Responsive — Mobile (< 680px)
   ─────────────────────────────────────────────── */
@media (max-width: 680px) {
    .navbar {
        padding: 0 0.8rem;
    }
    .main-container {
        padding: 1.6rem 0.8rem 2rem;
    }
    .card-grid {
        grid-template-columns: 1fr;
        gap: 0.55rem;
    }
    .page-header h1 {
        font-size: 1.5rem;
    }
    .footer-inner {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
    .footer-copyright {
        justify-content: center;
    }
    /* Modal fullscreen on mobile */
    .modal-dialog {
        max-width: 100% !important;
        max-height: 100% !important;
        border-radius: 0 !important;
        height: 100% !important;
    }
    .content-modal-dialog {
        width: 90vw !important;
        max-width: 90vw !important;
    }
}