@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;700&family=Noto+Sans+TC:wght@400;500;700&family=Noto+Serif+TC:wght@600;700;900&display=swap');

:root {
    --surface-0: #f8fafc;
    --surface-1: #ecf2ff;
    --surface-2: #e0e7ff;
    --ink-1: #0f172a;
    --accent: #2563eb;
    --accent-strong: #1d4ed8;
    --ring: rgba(37, 99, 235, 0.4);
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans TC', sans-serif;
    color: var(--ink-1);
    background-color: var(--surface-0);
    background-image:
        radial-gradient(circle at 8% 0%, rgba(56, 189, 248, 0.2), transparent 38%),
        radial-gradient(circle at 92% 8%, rgba(99, 102, 241, 0.22), transparent 30%),
        linear-gradient(180deg, #f8fbff 0%, #eef2ff 45%, #f8fafc 100%);
    min-height: 100vh;
}

h1,
h2,
h3,
h4 {
    font-family: 'Noto Serif TC', 'Noto Sans TC', serif;
    letter-spacing: 0.01em;
}

main {
    animation: page-rise 0.7s cubic-bezier(0.23, 1, 0.32, 1) both;
}

@keyframes page-rise {
    from {
        opacity: 0;
        transform: translateY(14px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

header {
    position: relative;
    overflow: hidden;
    background: linear-gradient(120deg, #312e81 0%, #3730a3 45%, #1d4ed8 100%);
}

header::after {
    content: "";
    position: absolute;
    inset: 0;
    pointer-events: none;
    opacity: 0.25;
    background:
        linear-gradient(90deg, transparent 0 45%, rgba(255, 255, 255, 0.4) 50%, transparent 55% 100%),
        linear-gradient(0deg, transparent 0 45%, rgba(255, 255, 255, 0.3) 50%, transparent 55% 100%);
    background-size: 120px 120px;
}

nav {
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.82) !important;
}

nav button {
    position: relative;
    transition: color 0.25s ease, background-color 0.25s ease, transform 0.25s ease;
}

nav button:hover {
    transform: translateY(-1px);
}

nav button::after {
    content: "";
    position: absolute;
    left: 20%;
    right: 20%;
    bottom: 2px;
    height: 3px;
    border-radius: 999px;
    background: linear-gradient(90deg, #0ea5e9, var(--accent));
    transform: scaleX(0);
    transform-origin: center;
    transition: transform 0.28s ease;
}

nav button:not(.active-tab):hover::after {
    transform: scaleX(1);
}

nav button.active-tab::after {
    transform: scaleX(0);
}

.code-font {
    font-family: 'JetBrains Mono', monospace;
}

.concept-card {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.memory-node {
    animation: fadeIn 0.5s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.active-tab {
    background-color: rgba(219, 234, 254, 0.78);
    color: var(--accent-strong) !important;
    border-bottom: 4px solid #38bdf8 !important;
    box-shadow: inset 0 -2px 0 0 #38bdf8;
}

.line-active {
    background-color: #1e293b;
    border-left: 4px solid #6366f1 !important;
}

.parking-spot {
    position: relative;
    border: 2px dashed #cbd5e1;
    background: #f1f5f9;
}

.parking-spot::after {
    content: "SPOT";
    position: absolute;
    bottom: 2px;
    right: 4px;
    font-size: 8px;
    color: #94a3b8;
    font-weight: bold;
}

/* Simplified Interactive Code Styles */
.diagram-container {
    background: #0f172a;
    border-radius: 2rem;
    padding: 2rem;
    /* Reduced padding to make room for line numbers */
    color: white;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    display: flex;
    position: relative;
}

.copy-btn {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: rgba(255, 255, 255, 0.8);
    padding: 0.5rem 1rem;
    border-radius: 0.75rem;
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    backdrop-filter: blur(4px);
    z-index: 10;
}

.copy-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border-color: rgba(255, 255, 255, 0.4);
}

.copy-btn:active {
    transform: scale(0.95);
}

.copy-btn.success {
    background: #22c55e;
    color: white;
    border-color: #22c55e;
}

.line-numbers {
    text-align: right;
    padding-right: 1.5rem;
    border-right: 1px solid rgba(255, 255, 255, 0.1);
    margin-right: 1.5rem;
    color: rgba(255, 255, 255, 0.3);
    user-select: none;
    font-family: 'JetBrains Mono', monospace;
}

.clickable-word {
    cursor: pointer;
    padding: 2px 6px;
    border-radius: 6px;
    transition: all 0.3s;
    display: inline-block;
}

.clickable-word:hover {
    background: rgba(255, 255, 255, 0.15);
}

.word-highlight {
    background: rgba(34, 197, 94, 0.25) !important;
    box-shadow: 0 0 15px rgba(34, 197, 94, 0.4);
    color: #4ade80 !important;
    transform: translateY(-2px);
}

.fade-in-up {
    animation: fadeInUp 0.4s ease-out forwards;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Web Flow UI */
.web-node {
    transition: all 0.3s;
    border: 2px solid #e2e8f0;
    z-index: 20;
}

.web-node.active {
    border-color: #3b82f6;
    background-color: #eff6ff;
    box-shadow: 0 10px 20px -5px rgba(59, 130, 246, 0.3);
    transform: translateY(-5px);
}

.flow-path {
    stroke: #cbd5e1;
    stroke-width: 3;
    fill: none;
    stroke-dasharray: 8;
    transition: stroke 0.3s;
}

.flow-path.active {
    stroke: #3b82f6;
    animation: dashmove 2s linear infinite;
}

@keyframes dashmove {
    to {
        stroke-dashoffset: -32;
    }
}

.packet {
    fill: #ef4444;
    filter: drop-shadow(0 0 5px rgba(239, 68, 68, 0.6));
    transition: fill 0.3s;
}

.packet.encrypted {
    fill: #10b981;
    filter: drop-shadow(0 0 8px rgba(16, 185, 129, 0.8));
}

/* Server Action Highlighting */
.server-step {
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.server-step-active {
    background-color: #4f46e5 !important;
    color: white !important;
    border-color: #4338ca !important;
    opacity: 1 !important;
    transform: scale(1.05);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

/* Login UI Simulation */
.login-screen {
    background: white;
    border: 1px solid #e2e8f0;
    border-radius: 0.75rem;
    padding: 0.5rem;
    font-size: 8px;
    text-align: left;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.login-btn {
    background: #4f46e5;
    color: white;
    border-radius: 4px;
    padding: 2px 8px;
    margin-top: 4px;
    display: inline-block;
    cursor: pointer;
    transition: transform 0.16s ease, background-color 0.2s ease, box-shadow 0.2s ease;
}

.login-btn-clicking {
    transform: translateY(1px) scale(0.96);
    background: #4338ca;
    box-shadow: inset 0 1px 2px rgba(15, 23, 42, 0.3), 0 0 0 1px rgba(79, 70, 229, 0.32);
}

.success-badge {
    animation: bounce 0.5s infinite alternate;
}

@keyframes bounce {
    from {
        transform: scale(1);
    }

    to {
        transform: scale(1.1);
    }
}

/* Zone Labels */
.zone-box {
    position: absolute;
    top: 0;
    bottom: 0;
    pointer-events: none;
    border: 2px dashed rgba(0, 0, 0, 0.05);
    border-radius: 2rem;
    padding: 1rem;
}

.zone-label {
    position: absolute;
    top: 1rem;
    font-weight: 900;
    font-size: 10px;
    letter-spacing: 0.2em;
    text-transform: uppercase;
}

/* SSL Comparison Box */
.comparison-card {
    background: #1e293b;
    border-radius: 1.5rem;
    padding: 0.75rem;
    color: white;
    font-family: 'JetBrains Mono', monospace;
    box-shadow: inset 0 2px 4px 0 rgba(0, 0, 0, 0.06);
    flex: 1;
}

.data-stream {
    font-size: 10px;
    padding: 0.5rem;
    border-radius: 0.5rem;
    margin-top: 0.25rem;
    word-break: break-all;
}

.unencrypted {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: #f87171;
}

.encrypted-text {
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.3);
    color: #34d399;
}

.highlight-card {
    transform: scale(1.05);
    box-shadow: 0 0 20px rgba(59, 130, 246, 0.5);
    z-index: 10;
}

.highlight-card.border-red-500 {
    box-shadow: 0 0 25px rgba(239, 68, 68, 0.6);
}

.highlight-card.border-emerald-500 {
    box-shadow: 0 0 25px rgba(16, 185, 129, 0.6);
}

/* Sidebar Step Styles */
.step-item {
    transition: all 0.4s ease;
    border-left: 4px solid transparent;
    opacity: 0.5;
}

.step-highlight {
    opacity: 1;
    border-left-color: #4f46e5;
    background: rgba(79, 70, 229, 0.1);
    transform: translateX(5px);
    color: #1e1b4b;
    font-weight: 600;
}

/* AI Magic Section Styles */
.ai-chat-bubble {
    position: relative;
    background: #f1f5f9;
    border-radius: 1.5rem;
    padding: 1.5rem;
    border-bottom-left-radius: 0;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
}

.ai-response-bubble {
    background: #e0e7ff;
    border-radius: 1.5rem;
    padding: 1.5rem;
    border-bottom-right-radius: 0;
    border: 1px solid #c7d2fe;
}

.rct-card {
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.rct-card:hover {
    border-color: #6366f1;
    transform: translateY(-5px);
    background: #fdf2f8;
}

.skeleton-muscle-container {
    display: flex;
    gap: 2rem;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    background: #1e293b;
    border-radius: 2rem;
    color: white;
}

/* Modifier Table Styles */
.modifier-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
    font-size: 0.8rem;
    background: white;
    border-radius: 0.5rem;
    overflow: hidden;
    box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);
}

.modifier-table th {
    background: #f1f5f9;
    padding: 0.5rem;
    text-align: center;
    color: #475569;
}

.modifier-table td {
    padding: 0.5rem;
    text-align: center;
    border-top: 1px solid #f1f5f9;
}

.check-v {
    color: #22c55e;
    font-weight: bold;
}

.check-x {
    color: #ef4444;
    opacity: 0.5;
}

.current-row {
    background-color: #f0fdf4;
    font-weight: bold;
    color: #166534;
}

/* Factory Styles */
.car-instance {
    transition: all 0.5s ease;
    animation: slideIn 0.5s ease-out;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-50px);
    }

    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes hammer-hit {
    0% {
        transform: rotate(45deg);
    }

    50% {
        transform: rotate(-10deg);
    }

    100% {
        transform: rotate(45deg);
    }
}

.hammer-animate {
    animation: hammer-hit 0.3s ease-in-out infinite;
}

#for-progress-bar {
    background: linear-gradient(90deg, #10b981 0%, #34d399 55%, #6ee7b7 100%);
    transition: width 0.46s cubic-bezier(0.22, 1, 0.36, 1);
}

.for-speed-btn {
    color: #cbd5e1;
    border: 1px solid rgba(100, 116, 139, 0.6);
    background: rgba(15, 23, 42, 0.8);
}

.for-speed-btn:hover:not(.is-disabled) {
    color: #e2e8f0;
    border-color: rgba(148, 163, 184, 0.8);
    background: rgba(30, 41, 59, 0.95);
}

.for-speed-btn.is-active {
    color: #ecfeff;
    border-color: rgba(20, 184, 166, 0.8);
    background: linear-gradient(135deg, #059669 0%, #10b981 100%);
    box-shadow: 0 0 0 1px rgba(110, 231, 183, 0.3), 0 10px 22px -14px rgba(16, 185, 129, 0.7);
}

.for-speed-btn.is-disabled {
    opacity: 0.55;
    cursor: not-allowed;
}

.factory-worker-busy {
    animation: factory-worker-busy 0.58s ease-in-out infinite alternate;
    transform-origin: center bottom;
    position: relative;
}

.factory-worker-busy::after {
    content: "";
    position: absolute;
    inset: 8px;
    border-radius: 999px;
    border: 1px solid rgba(96, 165, 250, 0.45);
    animation: worker-halo 1.1s ease-out infinite;
    pointer-events: none;
}

@keyframes factory-worker-busy {
    from {
        transform: translateY(0) rotate(-0.5deg) scale(1);
        filter: drop-shadow(0 0 8px rgba(99, 102, 241, 0.2));
    }

    to {
        transform: translateY(-2px) rotate(0.6deg) scale(1.025);
        filter: drop-shadow(0 0 16px rgba(99, 102, 241, 0.45));
    }
}

@keyframes worker-halo {
    0% {
        opacity: 0.55;
        transform: scale(0.94);
    }

    100% {
        opacity: 0;
        transform: scale(1.22);
    }
}

.for-conveyor-track {
    position: absolute;
    isolation: isolate;
}

.for-conveyor-track::before {
    content: "";
    position: absolute;
    inset: 0;
    opacity: 0;
    pointer-events: none;
    background:
        repeating-linear-gradient(115deg,
            rgba(148, 163, 184, 0.34) 0 14px,
            rgba(51, 65, 85, 0.12) 14px 28px);
    transform: translateX(0);
    transition: opacity 0.25s ease;
    z-index: 0;
}

.for-conveyor-track #conveyor-belt {
    position: relative;
    z-index: 1;
}

.for-conveyor-track .absolute {
    z-index: 1;
}

.conveyor-running::before {
    opacity: 0.38;
    animation: conveyor-running 0.45s linear infinite;
}

@keyframes conveyor-running {
    0% {
        transform: translateX(0);
    }

    100% {
        transform: translateX(-28px);
    }
}

.for-visual-active {
    box-shadow: inset 0 0 0 1px rgba(16, 185, 129, 0.35), 0 20px 35px -24px rgba(16, 185, 129, 0.35);
}

.concept-section {
    position: relative;
}

.section-enter {
    animation: section-enter 0.55s cubic-bezier(0.22, 1, 0.36, 1);
}

@keyframes section-enter {
    from {
        opacity: 0;
        transform: translateY(16px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.concept-card,
.rct-card,
.car-instance {
    will-change: transform;
}

button {
    transition: transform 0.25s ease, box-shadow 0.25s ease;
}

button:hover {
    box-shadow: 0 10px 22px -14px rgba(15, 23, 42, 0.55);
}

button:focus-visible,
.clickable-word:focus-visible {
    outline: none;
    box-shadow: 0 0 0 3px var(--ring);
    border-radius: 0.6rem;
}

@media (max-width: 768px) {
    body {
        background-image:
            radial-gradient(circle at 10% 0%, rgba(56, 189, 248, 0.16), transparent 34%),
            radial-gradient(circle at 90% 4%, rgba(99, 102, 241, 0.16), transparent 24%),
            linear-gradient(180deg, #f8fbff 0%, #eef2ff 42%, #f8fafc 100%);
    }

    header::after {
        opacity: 0.14;
    }

    nav button::after {
        left: 28%;
        right: 28%;
    }

}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    .flow-path.active {
        animation: none !important;
    }
}