/* Main Application Styles — Cyberpunk UI */
@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@500;600;700;800;900&family=Rajdhani:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500;700&family=Share+Tech+Mono&display=swap');

* {
    box-sizing: border-box;
}

html, body {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    width: 100%;
    max-width: 100%;
    overflow-x: hidden;
}

body {
    font-family: var(--font-family);
    font-size: var(--text-base);
    min-height: 100vh;
    position: relative;
    overflow-x: hidden;
    background:
        radial-gradient(ellipse at 15% 0%, rgba(0, 240, 255, 0.10), transparent 55%),
        radial-gradient(ellipse at 85% 100%, rgba(178, 75, 243, 0.10), transparent 55%),
        radial-gradient(circle at 50% 50%, rgba(252, 238, 10, 0.03), transparent 70%),
        linear-gradient(180deg, #05060f 0%, #0a0f1f 100%);
    -webkit-font-smoothing: antialiased;
    letter-spacing: 0.2px;
}

/* Global cyberpunk grid overlay */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    background-image:
        linear-gradient(rgba(0, 240, 255, 0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 240, 255, 0.05) 1px, transparent 1px);
    background-size: 42px 42px;
    mask-image: radial-gradient(ellipse at center, black 40%, transparent 100%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 40%, transparent 100%);
}

/* Scanlines overlay */
body::after {
    content: '';
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 1;
    background: repeating-linear-gradient(
        180deg,
        rgba(255, 255, 255, 0.015) 0 1px,
        transparent 1px 3px
    );
    mix-blend-mode: overlay;
}

.app-container, .main-content, .header, .login-page {
    position: relative;
    z-index: 2;
}

/* Selection */
::selection {
    background: var(--primary);
    color: var(--text-inverse);
    text-shadow: none;
}

/* Scrollbars */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--bg-secondary); }
::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, var(--primary-dark), var(--violet-hover));
    border-radius: 0;
    box-shadow: var(--glow-cyan-sm);
}
::-webkit-scrollbar-thumb:hover { background: var(--primary); }

/* Layout */
.app-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    width: 100%;
    max-width: 100%;
    overflow-x: hidden;
}

.main-content {
    flex: 1;
    padding: var(--spacing-lg);
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
    min-width: 0;
}

a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-light); text-shadow: var(--glow-cyan-sm); }

/* ============================ HEADER ============================ */
.header {
    position: sticky;
    top: 0;
    z-index: 50;
    overflow: visible;
    background:
        linear-gradient(180deg, rgba(10, 15, 31, 0.92) 0%, rgba(5, 6, 15, 0.92) 100%);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-strong);
    box-shadow: 0 1px 0 rgba(0, 240, 255, 0.45), 0 10px 30px rgba(0, 0, 0, 0.6);
}

.header::after {
    content: '';
    display: block;
    height: 2px;
    background: linear-gradient(
        90deg,
        transparent 0%,
        var(--primary) 15%,
        var(--violet) 50%,
        var(--accent) 85%,
        transparent 100%
    );
    box-shadow: 0 0 12px var(--primary);
    animation: neonPulse 4s ease-in-out infinite;
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
    min-width: 0;
    overflow: visible;
}

.header-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    min-width: 0;
}

.header-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    min-width: 0;
}

.header-logo img,
.header-logo svg {
    height: 40px;
    width: auto;
    filter: drop-shadow(0 0 6px rgba(0, 240, 255, 0.65));
}

.header-logo h1 {
    font-family: var(--font-display);
    font-size: 1.05rem;
    font-weight: 700;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--primary);
    text-shadow: 0 0 8px rgba(0, 240, 255, 0.6), 0 0 2px rgba(0, 240, 255, 0.9);
    margin: 0;
    min-width: 0;
}

.header-center {
    flex: 1;
    max-width: 520px;
    margin: 0 var(--spacing-lg);
    min-width: 0;
}

.search-wrapper {
    position: relative;
}

.search-wrapper .form-input {
    padding-left: calc(var(--spacing-md) * 2 + 20px);
    padding-right: var(--spacing-lg);
}

.search-wrapper .search-icon {
    position: absolute;
    left: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    color: var(--primary);
    filter: drop-shadow(0 0 4px rgba(0, 240, 255, 0.6));
}

.header-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    justify-content: flex-end;
    min-width: 0;
    flex-shrink: 0;
}

.user-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius);
    background: var(--bg-glass);
    cursor: pointer;
    transition: all var(--transition);
    clip-path: var(--clip-bevel-sm);
}

.user-info:hover {
    background: rgba(0, 240, 255, 0.08);
    border-color: var(--primary);
    box-shadow: var(--glow-cyan-sm);
}

.user-info-mini {
    min-width: 0;
    flex: 0 0 auto;
}

.user-avatar {
    width: 36px;
    height: 36px;
    border-radius: 0;
    border: 1px solid var(--primary);
    background: linear-gradient(135deg, var(--primary-deep) 0%, var(--violet-deep) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 0.8rem;
    letter-spacing: 1px;
    box-shadow: inset 0 0 8px rgba(0, 240, 255, 0.4), 0 0 6px rgba(0, 240, 255, 0.3);
    clip-path: var(--clip-bevel-sm);
}

.user-details {
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.user-name {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--text-primary);
    font-family: var(--font-display);
    letter-spacing: 1px;
}

.user-role {
    font-size: var(--text-xs);
    color: var(--accent);
    font-family: var(--font-mono);
    letter-spacing: 1.2px;
    text-transform: uppercase;
}

/* ============================ PAGE HEADER ============================ */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--border);
    position: relative;
}

.page-header::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 120px;
    height: 2px;
    background: linear-gradient(90deg, var(--primary), transparent);
    box-shadow: var(--glow-cyan-sm);
}

.page-title {
    font-family: var(--font-display);
    font-size: var(--text-2xl);
    font-weight: 800;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--text-primary);
    text-shadow: 0 0 10px rgba(0, 240, 255, 0.4);
    margin: 0;
}

.page-title::before {
    content: '// ';
    color: var(--primary);
    font-weight: 500;
}

.page-description {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    margin-top: var(--spacing-sm);
    font-family: var(--font-mono);
    letter-spacing: 0.5px;
}

/* ============================ KB GRID ============================ */
.kb-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: var(--spacing-lg);
    width: 100%;
    min-width: 0;
}

@media (min-width: 768px) {
    .kb-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 1024px) {
    .kb-grid { grid-template-columns: repeat(3, 1fr); }
}

/* ============================ LOGIN PAGE ============================ */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
    background:
        radial-gradient(circle at 20% 30%, rgba(0, 240, 255, 0.22), transparent 45%),
        radial-gradient(circle at 80% 20%, rgba(178, 75, 243, 0.22), transparent 45%),
        radial-gradient(circle at 60% 90%, rgba(252, 238, 10, 0.10), transparent 55%),
        linear-gradient(180deg, #03040a 0%, #05060f 55%, #0a0f1f 100%);
    position: relative;
    overflow: hidden;
}

.login-page::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(0, 240, 255, 0.10) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 240, 255, 0.10) 1px, transparent 1px);
    background-size: 48px 48px;
    pointer-events: none;
    mask-image: linear-gradient(180deg, transparent, black 30%, black 70%, transparent);
    -webkit-mask-image: linear-gradient(180deg, transparent, black 30%, black 70%, transparent);
    animation: gridDrift 24s linear infinite;
}

/* Horizon line on login bg */
.login-page::after {
    content: '';
    position: absolute;
    left: 0; right: 0;
    bottom: 28%;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--primary), transparent);
    box-shadow: 0 0 18px var(--primary), 0 0 48px var(--primary);
    pointer-events: none;
}

.login-container {
    width: 100%;
    max-width: 460px;
    position: relative;
    z-index: 1;
}

.login-card {
    background:
        linear-gradient(180deg, rgba(10, 15, 31, 0.92) 0%, rgba(5, 6, 15, 0.92) 100%);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    border: 1px solid var(--border-strong);
    border-radius: 0;
    box-shadow:
        0 0 0 1px rgba(0, 240, 255, 0.25),
        0 0 24px rgba(0, 240, 255, 0.28),
        0 30px 80px rgba(0, 0, 0, 0.7);
    padding: var(--spacing-2xl);
    animation: fadeIn 0.5s cubic-bezier(.2,.8,.2,1);
    position: relative;
    clip-path: var(--clip-notch);
}

/* Neon corner brackets */
.login-card::before,
.login-card::after {
    content: '';
    position: absolute;
    width: 28px;
    height: 28px;
    border: 2px solid var(--primary);
    box-shadow: var(--glow-cyan-sm);
    pointer-events: none;
}
.login-card::before {
    top: 10px; left: 10px;
    border-right: none;
    border-bottom: none;
}
.login-card::after {
    bottom: 10px; right: 10px;
    border-left: none;
    border-top: none;
}

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

.login-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.login-logo {
    width: 88px;
    height: 88px;
    margin: 0 auto var(--spacing-md);
    filter: drop-shadow(0 0 10px rgba(0, 240, 255, 0.75)) drop-shadow(0 0 24px rgba(0, 240, 255, 0.35));
    animation: neonFloat 4s ease-in-out infinite;
}

@keyframes neonFloat {
    0%, 100% { transform: translateY(0); filter: drop-shadow(0 0 10px rgba(0, 240, 255, 0.75)) drop-shadow(0 0 24px rgba(0, 240, 255, 0.35)); }
    50%      { transform: translateY(-4px); filter: drop-shadow(0 0 14px rgba(0, 240, 255, 0.95)) drop-shadow(0 0 36px rgba(178, 75, 243, 0.45)); }
}

.login-title {
    font-family: var(--font-display);
    font-size: var(--text-xl);
    font-weight: 800;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    text-shadow:
        0 0 8px rgba(0, 240, 255, 0.6),
        0 0 2px rgba(0, 240, 255, 0.9);
    position: relative;
}

/* Glitch effect on login title */
.login-title::before,
.login-title::after {
    content: attr(data-text);
    position: absolute;
    inset: 0;
    pointer-events: none;
    opacity: 0.6;
}
.login-title::before {
    color: var(--violet);
    transform: translate(2px, 0);
    mix-blend-mode: screen;
    animation: glitchX 3.5s infinite linear;
}
.login-title::after {
    color: var(--accent);
    transform: translate(-2px, 0);
    mix-blend-mode: screen;
    animation: glitchX 3.5s infinite linear reverse;
}

@keyframes glitchX {
    0%, 90%, 100% { transform: translate(0, 0); opacity: 0; }
    91%, 93%      { transform: translate(2px, -1px); opacity: 0.5; }
    94%, 96%      { transform: translate(-3px, 1px); opacity: 0.5; }
    97%, 99%      { transform: translate(1px, 0); opacity: 0.3; }
}

.login-subtitle {
    font-family: var(--font-mono);
    font-size: var(--text-sm);
    color: var(--text-secondary);
    letter-spacing: 1px;
    text-transform: uppercase;
}

.login-subtitle::before {
    content: '> ';
    color: var(--accent);
}

.login-error {
    background: rgba(255, 0, 60, 0.08);
    border: 1px solid var(--danger);
    border-left-width: 4px;
    padding: var(--spacing-md);
    border-radius: 0;
    margin-bottom: var(--spacing-md);
    color: #ff6680;
    font-size: var(--text-sm);
    font-family: var(--font-mono);
    display: none;
    box-shadow: var(--glow-danger);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.login-error.show {
    display: block;
    animation: shake 0.35s cubic-bezier(.36,.07,.19,.97);
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-6px); }
    75% { transform: translateX(6px); }
}

/* ============================ BREADCRUMB ============================ */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--text-sm);
    font-family: var(--font-mono);
    color: var(--text-muted);
    margin-bottom: var(--spacing-lg);
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.breadcrumb a {
    color: var(--primary);
    font-weight: 600;
}

.breadcrumb a:hover {
    color: var(--primary-light);
    text-shadow: var(--glow-cyan-sm);
}

.breadcrumb-separator {
    color: var(--accent);
    font-weight: 700;
}

/* ============================ ARTICLE VIEW ============================ */
.article-container {
    max-width: 900px;
    margin: 0 auto;
    background:
        linear-gradient(180deg, rgba(10, 15, 31, 0.75) 0%, rgba(5, 6, 15, 0.75) 100%);
    backdrop-filter: blur(8px);
    border: 1px solid var(--border-strong);
    border-radius: 0;
    box-shadow: var(--shadow-lg), 0 0 0 1px rgba(0, 240, 255, 0.12);
    padding: var(--spacing-xl);
    clip-path: var(--clip-notch);
    position: relative;
}

.article-header {
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--border);
    position: relative;
}

.article-header::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 160px;
    height: 2px;
    background: linear-gradient(90deg, var(--primary), var(--violet), transparent);
    box-shadow: var(--glow-cyan-sm);
}

.article-title {
    font-family: var(--font-display);
    font-size: var(--text-3xl);
    font-weight: 800;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    line-height: var(--leading-tight);
    text-shadow: 0 0 10px rgba(0, 240, 255, 0.4);
}

.article-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-lg);
    color: var(--text-muted);
    font-size: var(--text-sm);
    font-family: var(--font-mono);
    letter-spacing: 0.8px;
    text-transform: uppercase;
}

.article-meta-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.article-meta-item svg { color: var(--primary); }

.article-description {
    background: linear-gradient(135deg, rgba(0, 240, 255, 0.06) 0%, rgba(178, 75, 243, 0.06) 100%);
    border: 1px solid var(--border);
    border-left: 3px solid var(--primary);
    padding: var(--spacing-lg);
    border-radius: 0;
    margin-bottom: var(--spacing-xl);
    color: var(--text-secondary);
    box-shadow: inset 0 0 30px rgba(0, 240, 255, 0.05);
    font-size: var(--text-base);
    line-height: var(--leading-relaxed);
}

.article-content {
    font-size: var(--text-base);
    line-height: 1.8;
    color: var(--text-primary);
}

.article-content h1,
.article-content h2,
.article-content h3 {
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
    font-family: var(--font-display);
    font-weight: 700;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    line-height: var(--leading-tight);
    color: var(--primary);
    text-shadow: 0 0 6px rgba(0, 240, 255, 0.35);
}

.article-content h1 { font-size: var(--text-2xl); }
.article-content h2 { font-size: var(--text-xl); }
.article-content h3 { font-size: var(--text-lg); }

.article-content p { margin-bottom: var(--spacing-sm); }

.article-content ul,
.article-content ol {
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-lg);
}

.article-content li {
    margin-bottom: var(--spacing-sm);
}

.article-content li::marker {
    color: var(--accent);
}

.article-content table {
    width: 100%;
    margin-bottom: var(--spacing-lg);
    border: 1px solid var(--border-strong);
    border-radius: 0;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.article-content th,
.article-content td {
    padding: var(--spacing-sm) var(--spacing-md);
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.article-content th {
    background: linear-gradient(90deg, var(--primary-deep), var(--violet-deep));
    color: var(--primary);
    font-family: var(--font-display);
    font-size: var(--text-xs);
    letter-spacing: 2px;
    text-transform: uppercase;
    font-weight: 700;
    text-shadow: 0 0 6px rgba(0, 240, 255, 0.5);
}

.article-content tr:nth-child(even) td {
    background: rgba(0, 240, 255, 0.03);
}

.article-content img {
    border: 1px solid var(--border-strong);
    border-radius: 0;
    cursor: pointer;
    transition: all var(--transition);
    max-width: 100%;
    height: auto;
    box-shadow: var(--shadow), 0 0 0 1px rgba(0, 240, 255, 0.2);
}

.article-content img:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg), var(--glow-cyan);
    border-color: var(--primary);
}

/* Code — terminal CRT */
.article-content pre,
.article-content code {
    font-family: var(--font-mono);
    background: #03040a;
    color: var(--primary);
    border-radius: 0;
    border: 1px solid var(--border-strong);
}

.article-content code {
    padding: 2px 6px;
    font-size: 0.95em;
    color: var(--accent);
    background: rgba(252, 238, 10, 0.06);
    border-color: rgba(252, 238, 10, 0.3);
}

.article-content pre {
    padding: var(--spacing-md);
    margin: var(--spacing-md) 0;
    overflow-x: auto;
    white-space: pre-wrap;
    word-wrap: break-word;
    word-break: break-all;
    max-width: 100%;
    line-height: 1.55;
    box-shadow: inset 0 0 40px rgba(0, 240, 255, 0.1), var(--glow-cyan-sm);
    text-shadow: 0 0 6px rgba(0, 240, 255, 0.5);
    position: relative;
}

.article-content pre::before {
    content: '> SYS:~$';
    position: absolute;
    top: 6px;
    right: 10px;
    font-size: 0.65rem;
    color: var(--accent);
    letter-spacing: 2px;
    opacity: 0.7;
}

.article-content pre code {
    padding: 0;
    background: transparent;
    color: inherit;
    border: none;
    white-space: pre-wrap;
    word-wrap: break-word;
}

/* ============================ ATTACHMENTS ============================ */
.attachments-section {
    margin-top: var(--spacing-2xl);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border);
}

.attachments-title {
    font-family: var(--font-display);
    font-size: var(--text-base);
    font-weight: 700;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--primary);
    margin-bottom: var(--spacing-md);
    text-shadow: var(--glow-cyan-sm);
}

.attachment-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.attachment-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md);
    background: var(--bg-glass);
    border: 1px solid var(--border);
    border-radius: 0;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition);
    clip-path: var(--clip-bevel-sm);
}

.attachment-item:hover {
    border-color: var(--primary);
    background: rgba(0, 240, 255, 0.06);
    box-shadow: var(--glow-cyan-sm);
    transform: translateX(3px);
}

.attachment-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.attachment-icon {
    width: 44px;
    height: 44px;
    border: 1px solid var(--primary);
    border-radius: 0;
    background: linear-gradient(135deg, var(--primary-deep), var(--violet-deep));
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    box-shadow: inset 0 0 14px rgba(0, 240, 255, 0.35), var(--glow-cyan-sm);
    clip-path: var(--clip-bevel-sm);
}

.attachment-details { display: flex; flex-direction: column; }

.attachment-name {
    font-weight: 600;
    color: var(--text-primary);
    font-size: var(--text-sm);
    font-family: var(--font-display);
    letter-spacing: 0.5px;
}

.attachment-size {
    font-size: var(--text-xs);
    color: var(--text-muted);
    font-family: var(--font-mono);
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* ============================ FORM ============================ */
.form-container {
    max-width: 900px;
    margin: 0 auto;
}

.form-section {
    background:
        linear-gradient(180deg, rgba(10, 15, 31, 0.72) 0%, rgba(5, 6, 15, 0.72) 100%);
    backdrop-filter: blur(8px);
    border: 1px solid var(--border-strong);
    border-radius: 0;
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow), 0 0 0 1px rgba(0, 240, 255, 0.12);
    clip-path: var(--clip-bevel);
}

.form-section-title {
    font-family: var(--font-display);
    font-size: var(--text-base);
    font-weight: 700;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--primary);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--border);
    text-shadow: var(--glow-cyan-sm);
    position: relative;
}

.form-section-title::before {
    content: '▸ ';
    color: var(--accent);
}

/* Upload Zone */
.upload-zone {
    border: 1px dashed var(--primary);
    border-radius: 0;
    padding: var(--spacing-2xl);
    text-align: center;
    transition: all var(--transition);
    cursor: pointer;
    background:
        repeating-linear-gradient(
            45deg,
            transparent 0 12px,
            rgba(0, 240, 255, 0.04) 12px 24px
        );
}

.upload-zone:hover,
.upload-zone.dragover {
    border-color: var(--accent);
    background:
        repeating-linear-gradient(
            45deg,
            transparent 0 12px,
            rgba(252, 238, 10, 0.08) 12px 24px
        );
    box-shadow: inset 0 0 60px rgba(0, 240, 255, 0.1), var(--glow-cyan-sm);
}

.upload-zone-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto var(--spacing-md);
    color: var(--primary);
    filter: drop-shadow(0 0 6px rgba(0, 240, 255, 0.6));
}

.upload-zone-text {
    font-family: var(--font-display);
    font-size: var(--text-sm);
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--text-secondary);
}

.upload-zone-hint {
    font-size: var(--text-xs);
    color: var(--text-muted);
    margin-top: var(--spacing-sm);
    font-family: var(--font-mono);
    letter-spacing: 1px;
}

/* File preview */
.file-preview-list { margin-top: var(--spacing-md); }

.file-preview-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-glass);
    border: 1px solid var(--border);
    border-radius: 0;
    box-shadow: var(--shadow-sm);
    margin-bottom: var(--spacing-sm);
}

.file-preview-info { display: flex; align-items: center; gap: var(--spacing-sm); }

.file-preview-thumb {
    width: 40px;
    height: 40px;
    border: 1px solid var(--primary);
    border-radius: 0;
    object-fit: cover;
}

/* Search results */
.search-results {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.search-result-item {
    background: var(--bg-glass);
    border: 1px solid var(--border);
    border-radius: 0;
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition);
    clip-path: var(--clip-bevel-sm);
}

.search-result-item:hover {
    border-color: var(--primary);
    box-shadow: var(--glow-cyan-sm);
    background: rgba(0, 240, 255, 0.05);
    transform: translateX(4px);
}

.search-highlight {
    background: var(--accent);
    color: var(--text-inverse);
    padding: 0 4px;
    border-radius: 0;
    font-weight: 700;
    box-shadow: 0 0 6px rgba(252, 238, 10, 0.6);
}

/* ============================ RESPONSIVE ============================ */
@media (max-width: 1024px), (hover: none) and (pointer: coarse) {
    .header-center { display: none; }
    .header-inner {
        display: grid;
        grid-template-columns: minmax(0, 1fr) auto;
        padding: var(--spacing-sm) var(--spacing-md);
        gap: var(--spacing-sm);
    }

    .header-left {
        gap: var(--spacing-sm);
        overflow: hidden;
    }

    .header-logo {
        gap: var(--spacing-xs);
    }

    .header-logo img,
    .header-logo svg {
        height: 34px;
        flex: 0 0 auto;
    }

    .header-logo h1 {
        max-width: 48vw;
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
        font-size: 0.86rem !important;
        letter-spacing: 1px;
    }

    .header-right {
        gap: var(--spacing-xs);
        justify-self: end;
    }

    .header-right > .btn,
    .header-right > a.btn,
    .header-right > button.btn,
    .header-left > .btn,
    .header-left > a.btn,
    .header-left > button.btn,
    .user-info-mini > .btn {
        width: 40px;
        height: 40px;
        min-width: 40px;
        padding: 0 !important;
        gap: 0;
        font-size: 0;
        letter-spacing: 0;
        flex: 0 0 auto;
    }

    .header-right > .btn svg,
    .header-right > a.btn svg,
    .header-right > button.btn svg,
    .header-left > .btn svg,
    .header-left > a.btn svg,
    .header-left > button.btn svg,
    .user-info-mini > .btn svg {
        width: 18px;
        height: 18px;
    }

    .theme-switcher,
    .dropdown {
        flex: 0 0 auto;
    }

    .theme-switcher-btn {
        width: 40px;
        height: 40px;
    }

    .user-info {
        width: 40px;
        height: 40px;
        min-width: 40px;
        padding: 0;
        justify-content: center;
        gap: 0;
    }

    .user-info .user-details,
    .user-info > svg,
    .user-info-mini .user-name {
        display: none;
    }

    .user-avatar {
        width: 32px;
        height: 32px;
    }

    .dropdown-menu,
    .theme-dropdown {
        right: 0;
        max-width: calc(100vw - 24px);
    }

    .notes-page .header-logo {
        margin-left: 0 !important;
    }

    .main-content {
        padding: var(--spacing-md);
        max-width: 100%;
        overflow-x: hidden;
    }

    .page-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-md);
    }

    .page-header > .flex {
        width: 100%;
        min-width: 0;
        flex-wrap: wrap;
    }

    .page-header select.form-input {
        flex: 1 1 140px;
        width: 100% !important;
        min-width: 0;
    }

    .kb-grid {
        grid-template-columns: minmax(0, 1fr);
        gap: var(--spacing-md);
    }

    .login-card { padding: var(--spacing-lg); }
    .article-title { font-size: var(--text-xl); }
    .article-container { padding: var(--spacing-md); }

    #search-form {
        flex-wrap: wrap;
    }

    #search-form .btn {
        flex: 1 1 160px;
    }
}

@media (max-width: 480px) {
    .header-inner {
        padding-inline: var(--spacing-sm);
    }

    .header-logo h1 {
        max-width: 42vw;
        font-size: 0.78rem !important;
    }

}

/* ============================ ANIMATIONS ============================ */
@keyframes gridDrift {
    from { background-position: 0 0; }
    to   { background-position: 48px 48px; }
}

@keyframes neonPulse {
    0%, 100% { opacity: 1; filter: brightness(1); }
    50%      { opacity: 0.85; filter: brightness(1.25); }
}

/* ============================ UTILITIES ============================ */
.text-center { text-align: center; }
.text-right { text-align: right; }
.flex { display: flex; }
.flex-1 { flex: 1 1 0; min-width: 0; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }
.gap-lg { gap: var(--spacing-lg); }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.hidden { display: none !important; }

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}