/* ========================================
   Apple Keynote Style — Design Tokens
   ======================================== */
:root {
    /* Colors */
    --black: #000000;
    --white: #f5f5f7;
    --gray: #86868b;
    --gray-light: #6e6e73;
    --gray-dark: #1d1d1f;
    --card-bg: #161617;
    --card-border: rgba(255, 255, 255, 0.08);
    --blue: #bf5af2;
    --blue-light: #d89cf6;
    --purple: #bf5af2;
    --green: #30d158;
    --orange: #ff9f0a;
    --pink: #ff375f;
    --yellow: #ffd60a;
    --teal: #64d2ff;

    /* Typography */
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

    /* Spacing */
    --section-padding: 160px;
    --container-max: 1080px;

    /* Animation */
    --ease-spring: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-out: cubic-bezier(0.33, 1, 0.68, 1);

    /* Border Radius */
    --radius-card: 24px;
    --radius-sm: 16px;
    --radius-pill: 100px;
}

/* ========================================
   Reset & Base
   ======================================== */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-main);
    background-color: var(--black);
    color: var(--white);
    line-height: 1.5;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
}

/* ========================================
   Header — Apple-Style Translucent Nav
   ======================================== */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 48px;
    z-index: 1000;
    transition: background-color 0.4s ease,
                backdrop-filter 0.4s ease;
}

header.scrolled {
    background-color: rgba(0, 0, 0, 0.72);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
}

.header-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
    height: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.1rem;
    font-weight: 600;
    letter-spacing: -0.01em;
    color: var(--white);
}

.logo-accent {
    color: var(--blue);
}

.nav-group {
    display: flex;
    align-items: center;
    gap: 8px;
}

.header-container nav {
    margin-right: 8px;
}

nav ul {
    display: flex;
    gap: 28px;
}

nav a {
    color: var(--gray);
    font-size: 0.8rem;
    font-weight: 400;
    letter-spacing: 0;
    transition: color 0.3s ease;
}

nav a:hover {
    color: var(--white);
}

.btn-contact {
    display: inline-block;
    background: var(--blue);
    color: var(--white);
    padding: 6px 18px;
    border-radius: var(--radius-pill);
    font-size: 0.8rem;
    font-weight: 500;
    transition: opacity 0.3s ease;
}

.btn-contact:hover {
    opacity: 0.85;
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 120px 24px 80px;
    position: relative;
    overflow: hidden;
}

.hero-avatar {
    margin-bottom: 40px;
    animation: heroFadeIn 1.2s var(--ease-out) 0.2s both;
}

.hero-avatar img {
    width: 160px;
    height: 160px;
    border-radius: 50%;
    object-fit: cover;
    box-shadow: 0 0 80px rgba(41, 151, 255, 0.15);
}

.hero h1 {
    font-size: clamp(2.5rem, 7vw, 5.5rem);
    font-weight: 700;
    letter-spacing: -0.04em;
    line-height: 1.08;
    margin-bottom: 24px;
    animation: heroFadeUp 1s var(--ease-out) 0.5s both;
}

.hero .subtitle {
    font-size: clamp(1rem, 2vw, 1.3rem);
    color: var(--gray);
    margin-bottom: 40px;
    font-weight: 400;
    animation: heroFadeUp 1s var(--ease-out) 0.7s both;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--blue);
    color: var(--white);
    padding: 14px 32px;
    border-radius: var(--radius-pill);
    font-size: 1rem;
    font-weight: 500;
    transition: opacity 0.3s ease, transform 0.3s ease;
    animation: heroFadeUp 1s var(--ease-out) 0.9s both;
}

.btn-primary:hover {
    opacity: 0.85;
    transform: scale(1.02);
}

.cursor {
    display: inline-block;
    margin-left: 2px;
    animation: blink 1s infinite step-end;
    font-weight: 300;
}

@keyframes blink {
    0%, 50% { opacity: 1; }
    50.1%, 100% { opacity: 0; }
}

.gradient-text {
    background: linear-gradient(90deg, var(--blue), var(--blue-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    color: var(--gray);
    font-size: 1.2rem;
    animation: scrollBounce 2s ease-in-out infinite;
    opacity: 0;
    animation: heroFadeUp 1s var(--ease-out) 1.2s both, scrollBounce 2s ease-in-out 2.5s infinite;
}

@keyframes heroFadeIn {
    from { opacity: 0; transform: scale(0.85); }
    to { opacity: 1; transform: scale(1); }
}

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

@keyframes scrollBounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(10px); }
}

/* ========================================
   Section Common
   ======================================== */
.section {
    padding: var(--section-padding) 0;
    position: relative;
}

.section-label {
    display: block;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--blue);
    margin-bottom: 12px;
}

.section-heading {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1.1;
    margin-bottom: 80px;
    color: var(--white);
}

.section-heading .text-gray {
    color: var(--purple);
}

/* ========================================
   About Section
   ======================================== */
.about-section {
    text-align: center;
}

.about-section .container {
    max-width: 900px;
}

.about-heading {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1.15;
    margin-bottom: 60px;
}

.about-lines {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.about-lines p {
    font-size: clamp(1.1rem, 2.2vw, 1.5rem);
    color: var(--gray);
    line-height: 1.7;
    font-weight: 400;
}

/* ========================================
   Projects — Feature Cards
   ======================================== */
.project-cards {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.project-hero-card {
    display: grid;
    grid-template-columns: 1fr 1fr;
    background: var(--card-bg);
    border-radius: var(--radius-card);
    overflow: hidden;
    min-height: 480px;
    border: 1px solid var(--card-border);
    transition: transform 0.6s var(--ease-spring);
}

.project-hero-card:hover {
    transform: scale(1.01);
}

.project-card-content {
    padding: 60px 50px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.project-tag {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--purple);
    margin-bottom: 16px;
    letter-spacing: 0.02em;
}

.project-card-content h3 {
    font-size: clamp(1.5rem, 3vw, 2.2rem);
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.15;
    margin-bottom: 16px;
}

.project-card-content p {
    font-size: 1rem;
    color: var(--gray);
    line-height: 1.7;
    max-width: 420px;
}

.project-card-visual {
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.project-gradient {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #1a0533 0%, #0d1b3e 40%, #0a1628 100%);
    position: relative;
}

.project-gradient::before {
    content: '';
    position: absolute;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(191, 90, 242, 0.3) 0%, transparent 70%);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation: gradientPulse 4s ease-in-out infinite;
}

@keyframes gradientPulse {
    0%, 100% { transform: translate(-50%, -50%) scale(1); opacity: 0.6; }
    50% { transform: translate(-50%, -50%) scale(1.3); opacity: 1; }
}

.project-secondary-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.project-mini-card {
    background: var(--card-bg);
    border-radius: var(--radius-card);
    padding: 50px 40px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    min-height: 240px;
    border: 1px solid var(--card-border);
    transition: transform 0.6s var(--ease-spring);
}

.project-mini-card:hover {
    transform: scale(1.01);
}

.project-mini-card .coming-icon {
    font-size: 2.5rem;
    margin-bottom: 20px;
    color: var(--gray-light);
}

.project-mini-card h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--gray-light);
}

.project-mini-card p {
    font-size: 0.9rem;
    color: var(--gray);
}

/* ========================================
   Skills — Bento Grid
   ======================================== */
.bento-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-auto-rows: 200px;
    gap: 16px;
}

.bento-card {
    border-radius: var(--radius-card);
    padding: 28px;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    position: relative;
    overflow: hidden;
    border: 1px solid var(--card-border);
    transition: transform 0.6s var(--ease-spring),
                box-shadow 0.6s var(--ease-spring);
}

.bento-card:hover {
    transform: scale(1.03) translateY(-4px);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.bento-card .bento-icon {
    font-size: 2.2rem;
    margin-bottom: 16px;
    position: relative;
    z-index: 1;
}

.bento-card h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 4px;
    position: relative;
    z-index: 1;
}

.bento-card .bento-desc {
    font-size: 0.85rem;
    color: var(--gray);
    position: relative;
    z-index: 1;
}

/* Bento Grid Spans */
.bento-span-2 { grid-column: span 2; }
.bento-span-row-2 { grid-row: span 2; }

/* Bento Card Color Themes */
.bento-card--blue {
    background: linear-gradient(160deg, #0c2a4a 0%, #161617 80%);
}
.bento-card--blue .bento-icon { color: var(--blue); }

.bento-card--yellow {
    background: linear-gradient(160deg, #3d3218 0%, #161617 80%);
}
.bento-card--yellow .bento-icon { color: var(--yellow); }

.bento-card--purple {
    background: linear-gradient(160deg, #2d1545 0%, #161617 80%);
}
.bento-card--purple .bento-icon { color: var(--purple); }

.bento-card--gradient-hero {
    background: linear-gradient(135deg, #0a1e3d 0%, #1a0a3d 50%, #161617 100%);
    justify-content: center;
    align-items: flex-start;
}
.bento-card--gradient-hero .bento-icon {
    font-size: 3rem;
    margin-bottom: 20px;
    background: linear-gradient(135deg, var(--blue), var(--purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.bento-card--gradient-hero h3 {
    font-size: 1.6rem;
    margin-bottom: 8px;
}
.bento-card--gradient-hero .bento-desc {
    font-size: 0.95rem;
    line-height: 1.5;
    max-width: 280px;
}

.bento-card--pink {
    background: linear-gradient(160deg, #3d1228 0%, #161617 80%);
}
.bento-card--pink .bento-icon { color: var(--pink); }

.bento-card--green {
    background: linear-gradient(160deg, #0d2e18 0%, #161617 80%);
}
.bento-card--green .bento-icon { color: var(--green); }

.bento-card--warm {
    background: linear-gradient(160deg, #2e2518 0%, #161617 80%);
}
.bento-card--warm .bento-icon { color: var(--orange); }

.bento-card--cool {
    background: linear-gradient(160deg, #152030 0%, #161617 80%);
}
.bento-card--cool .bento-icon { color: var(--teal); }

/* ========================================
   Journey / Activities — Vertical Timeline
   ======================================== */
.journey-list {
    max-width: 800px;
    margin: 0 auto;
}

.journey-item {
    display: grid;
    grid-template-columns: 100px 1fr;
    gap: 48px;
    padding: 28px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    align-items: baseline;
}

.journey-item:last-child {
    border-bottom: none;
}

.journey-date {
    font-size: 0.9rem;
    color: var(--gray);
    font-weight: 500;
    font-variant-numeric: tabular-nums;
    white-space: nowrap;
}

.journey-content h3 {
    font-size: 1.15rem;
    font-weight: 600;
    letter-spacing: -0.01em;
}

.journey-content p {
    font-size: 0.9rem;
    color: var(--gray);
    margin-top: 4px;
}

/* ========================================
   Contact
   ======================================== */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 16px;
}

.contact-card {
    background: var(--card-bg);
    border-radius: var(--radius-card);
    padding: 32px 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 12px;
    border: 1px solid var(--card-border);
    transition: transform 0.4s var(--ease-spring),
                background-color 0.3s ease;
}

.contact-card:hover {
    transform: translateY(-4px);
    background-color: #222224;
}

.contact-card .icon {
    font-size: 1.8rem;
    color: var(--white);
}

.contact-card .info {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.contact-card .label {
    font-size: 0.75rem;
    color: var(--gray);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.contact-card .value {
    font-size: 0.85rem;
    font-weight: 500;
}

/* ========================================
   Footer
   ======================================== */
footer {
    padding: 40px 0 60px;
    text-align: center;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
}

footer p {
    font-size: 0.8rem;
    color: var(--gray);
    line-height: 1.8;
}

/* ========================================
   Reveal Animation System
   ======================================== */
.reveal {
    opacity: 0;
    transform: translateY(80px);
    transition: opacity 1.2s var(--ease-spring),
                transform 1.2s var(--ease-spring);
    will-change: opacity, transform;
}

.reveal.active {
    opacity: 1;
    transform: none;
}

.reveal-scale {
    opacity: 0;
    transform: scale(0.88);
    transition: opacity 1s var(--ease-spring),
                transform 1s var(--ease-spring);
    will-change: opacity, transform;
}

.reveal-scale.active {
    opacity: 1;
    transform: none;
}

/* Stagger Delay System */
[data-delay="1"] { transition-delay: 0.08s; }
[data-delay="2"] { transition-delay: 0.16s; }
[data-delay="3"] { transition-delay: 0.24s; }
[data-delay="4"] { transition-delay: 0.32s; }
[data-delay="5"] { transition-delay: 0.4s; }
[data-delay="6"] { transition-delay: 0.48s; }
[data-delay="7"] { transition-delay: 0.56s; }
[data-delay="8"] { transition-delay: 0.64s; }
[data-delay="9"] { transition-delay: 0.72s; }
[data-delay="10"] { transition-delay: 0.8s; }

/* ========================================
   Responsive — Tablet
   ======================================== */
@media screen and (max-width: 1024px) {
    .bento-grid {
        grid-template-columns: repeat(2, 1fr);
        grid-auto-rows: 180px;
    }

    .project-hero-card {
        grid-template-columns: 1fr;
        min-height: auto;
    }

    .project-card-visual {
        min-height: 300px;
    }
}

/* ========================================
   Responsive — Mobile
   ======================================== */
@media screen and (max-width: 768px) {
    :root {
        --section-padding: 100px;
    }

    .header-container nav {
        display: none;
    }

    .hero h1 {
        font-size: clamp(2rem, 8vw, 3.5rem);
    }

    .bento-grid {
        grid-template-columns: 1fr 1fr;
        grid-auto-rows: 160px;
    }

    .bento-span-2 { grid-column: span 2; }

    .project-secondary-row {
        grid-template-columns: 1fr;
    }

    .contact-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .journey-item {
        grid-template-columns: 80px 1fr;
        gap: 24px;
    }

    .project-card-content {
        padding: 40px 30px;
    }

    .section-heading {
        margin-bottom: 50px;
    }
}

@media screen and (max-width: 480px) {
    .bento-grid {
        grid-template-columns: 1fr;
        grid-auto-rows: auto;
    }

    .bento-span-2 { grid-column: span 1; }
    .bento-span-row-2 { grid-row: span 1; }

    .bento-card {
        min-height: 160px;
    }

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

    .journey-item {
        grid-template-columns: 1fr;
        gap: 4px;
    }
}