/* ===================================
   CSS Variables & Reset
   =================================== */
:root {
    --color-bg: #0a0a0f;
    --color-surface: #151520;
    --color-surface-hover: #1a1a28;
    --color-border: #252535;
    --color-text: #e8e8f0;
    --color-text-muted: #9090a8;
    --color-primary: #00d9ff;
    --color-primary-dark: #00a8cc;
    --color-success: #00ff88;
    --color-danger: #ff3366;
    --color-warning: #ffaa00;
    
    --gradient-primary: linear-gradient(135deg, #00d9ff 0%, #0088ff 100%);
    --gradient-success: linear-gradient(135deg, #00ff88 0%, #00cc66 100%);
    --gradient-danger: linear-gradient(135deg, #ff3366 0%, #cc0044 100%);
    
    --font-display: 'Outfit', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.6);
    --shadow-glow: 0 0 20px rgba(0, 217, 255, 0.3);
    
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-display);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
    min-height: 100vh;
}

/* ===================================
   Background Effects
   =================================== */
.bg-grid {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(rgba(37, 37, 53, 0.3) 1px, transparent 1px),
        linear-gradient(90deg, rgba(37, 37, 53, 0.3) 1px, transparent 1px);
    background-size: 50px 50px;
    pointer-events: none;
    z-index: 0;
    animation: gridMove 20s linear infinite;
}

@keyframes gridMove {
    0% { transform: translate(0, 0); }
    100% { transform: translate(50px, 50px); }
}

.bg-gradient {
    position: fixed;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 30% 40%, rgba(0, 217, 255, 0.15) 0%, transparent 50%),
                radial-gradient(circle at 70% 60%, rgba(0, 136, 255, 0.1) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
    animation: gradientMove 15s ease-in-out infinite;
}

@keyframes gradientMove {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    50% { transform: translate(30px, 30px) rotate(5deg); }
}

/* ===================================
   Header
   =================================== */
.header {
    position: relative;
    z-index: 100;
    border-bottom: 1px solid var(--color-border);
    background: rgba(10, 10, 15, 0.8);
    backdrop-filter: blur(20px);
    animation: slideDown 0.6s var(--transition-base);
}

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

.header .container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1.5rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 900;
    color: var(--color-primary);
}

.logo svg {
    color: var(--color-primary);
}

.nav {
    display: flex;
    gap: 0.5rem;
}

.nav-btn {
    padding: 0.75rem 1.5rem;
    background: transparent;
    color: var(--color-text-muted);
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    font-family: var(--font-display);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
}

.nav-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-primary);
    opacity: 0;
    border-radius: var(--radius-sm);
    transition: opacity var(--transition-base);
    z-index: -1;
}

.nav-btn:hover {
    color: var(--color-text);
    border-color: var(--color-border);
}

.nav-btn.active {
    color: var(--color-text);
    border-color: var(--color-primary);
}

.nav-btn.active::before {
    opacity: 0.1;
}

/* ===================================
   Main Layout
   =================================== */
.main {
    position: relative;
    z-index: 1;
    padding: 3rem 0;
    min-height: calc(100vh - 100px);
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
}

.view {
    display: none;
    animation: fadeInUp 0.6s var(--transition-base);
}

.view.active {
    display: block;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===================================
   Hero Section
   =================================== */
.hero {
    text-align: center;
    margin-bottom: 4rem;
}

.title {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.title-line {
    font-size: 4rem;
    font-weight: 900;
    line-height: 1;
    letter-spacing: -0.03em;
}

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: shimmer 3s ease-in-out infinite;
}

@keyframes shimmer {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.8; }
}

.subtitle {
    font-size: 1.25rem;
    color: var(--color-text-muted);
    font-weight: 300;
}

/* ===================================
   Cards
   =================================== */
.card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    animation: cardEntry 0.6s var(--transition-base) backwards;
}

@keyframes cardEntry {
    from {
        opacity: 0;
        transform: translateY(20px) scale(0.98);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.card:hover {
    border-color: rgba(0, 217, 255, 0.3);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--color-border);
}

.card-header h2 {
    font-size: 1.5rem;
    font-weight: 700;
}

/* ===================================
   Forms
   =================================== */
.form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.form-group input,
.form-group select {
    padding: 1rem 1.25rem;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text);
    font-family: var(--font-display);
    font-size: 1rem;
    transition: all var(--transition-base);
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(0, 217, 255, 0.1);
}

.form-group input::placeholder {
    color: var(--color-text-muted);
    opacity: 0.5;
}

/* ===================================
   Buttons
   =================================== */
.btn {
    padding: 1rem 2rem;
    background: var(--color-surface);
    color: var(--color-text);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn:active {
    transform: translateY(0);
}

.btn-primary {
    background: var(--gradient-primary);
    border-color: var(--color-primary);
    color: white;
}

.btn-primary:hover {
    box-shadow: var(--shadow-md), var(--shadow-glow);
}

.btn-success {
    background: var(--gradient-success);
    border-color: var(--color-success);
    color: var(--color-bg);
}

.btn-danger {
    background: var(--gradient-danger);
    border-color: var(--color-danger);
    color: white;
}

.btn-text {
    padding: 0.5rem 1rem;
    background: transparent;
    color: var(--color-text-muted);
    border: none;
    font-size: 0.9rem;
    cursor: pointer;
    transition: color var(--transition-base);
}

.btn-text:hover {
    color: var(--color-primary);
}

/* ===================================
   Queue Visualization
   =================================== */
.queue-indicator {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.5rem 1rem;
    background: rgba(0, 217, 255, 0.1);
    border: 1px solid rgba(0, 217, 255, 0.3);
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
    font-weight: 700;
    color: var(--color-primary);
}

.pulse {
    width: 8px;
    height: 8px;
    background: var(--color-primary);
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.5;
        transform: scale(1.2);
    }
}

.queue-visual {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin: 2rem 0;
    padding: 2rem;
    background: var(--color-bg);
    border-radius: var(--radius-md);
    overflow-x: auto;
}

.queue-label {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--color-text-muted);
    white-space: nowrap;
}

.queue-container {
    flex: 1;
    display: flex;
    gap: 0.75rem;
    min-height: 100px;
    align-items: center;
    position: relative;
}

.queue-item {
    min-width: 180px;
    padding: 1.25rem;
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    animation: itemEnter 0.4s var(--transition-base);
    transition: all var(--transition-base);
}

@keyframes itemEnter {
    from {
        opacity: 0;
        transform: translateX(20px) scale(0.9);
    }
    to {
        opacity: 1;
        transform: translateX(0) scale(1);
    }
}

.queue-item:hover {
    border-color: var(--color-primary);
    transform: translateY(-2px);
}

.queue-item.processing {
    border-color: var(--color-primary);
    box-shadow: 0 0 20px rgba(0, 217, 255, 0.3);
    animation: processingPulse 1.5s ease-in-out infinite;
}

@keyframes processingPulse {
    0%, 100% {
        box-shadow: 0 0 20px rgba(0, 217, 255, 0.3);
    }
    50% {
        box-shadow: 0 0 30px rgba(0, 217, 255, 0.5);
    }
}

.queue-item.removing {
    animation: itemExit 0.4s var(--transition-base) forwards;
}

@keyframes itemExit {
    to {
        opacity: 0;
        transform: translateX(-20px) scale(0.9);
    }
}

.queue-item-id {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-primary);
    margin-bottom: 0.5rem;
}

.queue-item-name {
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.queue-item-type {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

.queue-empty {
    width: 100%;
    text-align: center;
    color: var(--color-text-muted);
    font-style: italic;
}

/* ===================================
   Statistics
   =================================== */
.queue-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--color-border);
}

.stat {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 900;
    font-family: var(--font-mono);
    color: var(--color-primary);
}

.stat-success {
    color: var(--color-success);
}

.stat-danger {
    color: var(--color-danger);
}

/* ===================================
   Admin Panel
   =================================== */
.algorithm-info {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.algorithm-badge {
    padding: 0.5rem 1rem;
    background: var(--gradient-primary);
    color: white;
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 700;
}

.algorithm-desc {
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

.current-request {
    min-height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.empty-state {
    text-align: center;
    color: var(--color-text-muted);
}

.empty-state svg {
    margin-bottom: 1rem;
    opacity: 0.5;
}

.request-details {
    padding: 2rem;
    background: var(--color-bg);
    border-radius: var(--radius-md);
    animation: fadeInUp 0.4s var(--transition-base);
}

.request-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: 1.5rem;
}

.request-id {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--color-primary);
}

.request-time {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

.request-info {
    display: grid;
    gap: 1rem;
}

.info-row {
    display: flex;
    justify-content: space-between;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--color-border);
}

.info-label {
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

.info-value {
    font-weight: 600;
}

.admin-actions {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
}

.admin-actions .btn {
    flex: 1;
}

/* ===================================
   History
   =================================== */
.history-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    max-height: 500px;
    overflow-y: auto;
}

.history-item {
    padding: 1.25rem;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    animation: fadeInUp 0.3s var(--transition-base);
}

.history-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}

.history-status {
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    font-weight: 600;
}

.history-status.approved {
    background: rgba(0, 255, 136, 0.2);
    color: var(--color-success);
}

.history-status.rejected {
    background: rgba(255, 51, 102, 0.2);
    color: var(--color-danger);
}

.history-time {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

.history-info {
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

/* ===================================
   Analytics
   =================================== */
.analytics-grid {
    display: grid;
    gap: 2rem;
}

.analytics-card {
    animation-delay: calc(var(--card-index, 0) * 0.1s);
}

.analytics-card h3 {
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.code-block {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    overflow-x: auto;
}

.code-block pre {
    margin: 0;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    line-height: 1.6;
    color: var(--color-text);
}

.code-block code {
    font-family: var(--font-mono);
}

.note {
    margin-top: 1rem;
    padding: 1rem;
    background: rgba(255, 170, 0, 0.1);
    border-left: 3px solid var(--color-warning);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.complexity-table {
    width: 100%;
    border-collapse: collapse;
}

.complexity-table th,
.complexity-table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--color-border);
}

.complexity-table th {
    background: var(--color-bg);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
}

.complexity-table code {
    font-family: var(--font-mono);
    color: var(--color-primary);
}

.fifo-demo {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    margin-top: 1.5rem;
}

.fifo-step {
    display: flex;
    gap: 1.5rem;
    align-items: start;
}

.step-number {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    color: white;
    border-radius: 50%;
    font-weight: 700;
    flex-shrink: 0;
}

.step-content {
    flex: 1;
}

.step-content strong {
    display: block;
    margin-bottom: 0.75rem;
    color: var(--color-primary);
}

.visual-queue {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1.5rem;
    background: var(--color-bg);
    border-radius: var(--radius-md);
}

.vq-item {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-weight: 700;
    font-size: 1.5rem;
}

.vq-item.vq-new {
    border-color: var(--color-success);
    color: var(--color-success);
}

.vq-item.vq-removing {
    border-color: var(--color-danger);
    color: var(--color-danger);
    opacity: 0.5;
}

.vq-arrow {
    color: var(--color-text-muted);
    font-size: 1.5rem;
}

.use-cases {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.use-cases li {
    display: flex;
    gap: 1rem;
    padding: 1.25rem;
    background: var(--color-bg);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}

.use-cases li:hover {
    background: var(--color-surface-hover);
    transform: translateX(8px);
}

.use-cases .icon {
    font-size: 2rem;
    flex-shrink: 0;
}

.use-cases strong {
    display: block;
    margin-bottom: 0.25rem;
    color: var(--color-primary);
}

.use-cases p {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin: 0;
}

.space-analysis {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.space-item {
    padding: 1.25rem;
    background: var(--color-bg);
    border-radius: var(--radius-md);
}

.space-item strong {
    display: block;
    margin-bottom: 0.5rem;
}

.space-item code {
    font-family: var(--font-mono);
    color: var(--color-primary);
    font-size: 1.1rem;
}

.space-item p {
    margin-top: 0.5rem;
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.implementation-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 1.5rem;
}

.impl-item h4 {
    margin-bottom: 1rem;
    color: var(--color-primary);
}

.impl-item ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.impl-item li {
    padding-left: 1.5rem;
    position: relative;
    color: var(--color-text-muted);
}

.impl-item li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--color-primary);
}

.full-width {
    grid-column: 1 / -1;
}

.complexity-badge {
    padding: 0.5rem 1rem;
    background: rgba(0, 217, 255, 0.1);
    border: 1px solid rgba(0, 217, 255, 0.3);
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--color-primary);
}

/* ===================================
   Toast Notifications
   =================================== */
.toast-container {
    position: fixed;
    top: 2rem;
    right: 2rem;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.toast {
    min-width: 300px;
    padding: 1.25rem;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: start;
    gap: 1rem;
    animation: toastEnter 0.3s var(--transition-base);
}

@keyframes toastEnter {
    from {
        opacity: 0;
        transform: translateX(100px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.toast.removing {
    animation: toastExit 0.3s var(--transition-base) forwards;
}

@keyframes toastExit {
    to {
        opacity: 0;
        transform: translateX(100px);
    }
}

.toast-icon {
    flex-shrink: 0;
    width: 24px;
    height: 24px;
}

.toast-content {
    flex: 1;
}

.toast-title {
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.toast-message {
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.toast.success {
    border-left: 3px solid var(--color-success);
}

.toast.error {
    border-left: 3px solid var(--color-danger);
}

.toast.info {
    border-left: 3px solid var(--color-primary);
}

/* ===================================
   Responsive
   =================================== */
@media (max-width: 768px) {
    .header .container {
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav {
        width: 100%;
    }
    
    .nav-btn {
        flex: 1;
    }
    
    .title-line {
        font-size: 2.5rem;
    }
    
    .queue-visual {
        flex-direction: column;
        align-items: stretch;
    }
    
    .queue-container {
        flex-direction: column;
    }
    
    .admin-actions {
        flex-direction: column;
    }
    
    .toast-container {
        left: 1rem;
        right: 1rem;
    }
    
    .toast {
        min-width: 0;
    }
}

/* ===================================
   Scrollbar
   =================================== */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--color-bg);
}

::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-primary);
}