/* Portfolio - Apple Product Page Aesthetic (Dark Default) */

/* ========== CSS Variables ========== */
:root {
    --color-bg: #0d0d0d;
    --color-bg-elevated: #121212;
    --color-bg-subtle: #1c1c1e;
    
    --color-text: #f5f5f7;
    --color-text-secondary: #a1a1a6;
    --color-text-tertiary: #6e6e73;
    
    --color-border: #2c2c2e;
    
    --font-sans: -apple-system, BlinkMacSystemFont, "Inter", "SF Pro Text", "SF Pro Display", "Helvetica Neue", sans-serif;
    --font-mono: "SF Mono", "Monaco", "Menlo", "Consolas", monospace;
    
    --font-size-eyebrow: 0.875rem;
    --font-size-body: 1.0625rem;
    --font-size-subhead: 1.25rem;
    --font-size-hero: clamp(2.5rem, 8vw, 4.5rem);
    --font-size-hero-xl: clamp(3rem, 10vw, 5.5rem);
    
    --line-height-tight: 1.05;
    --line-height-body: 1.65;
    
    --letter-spacing-tight: -0.04em;
    --letter-spacing-tighter: -0.05em;
    
    --spacing-section: clamp(4rem, 12vh, 8rem);
    --spacing-hero-inner: 1.5rem;
    
    --container-max: 1200px;
    --container-padding: 2rem;
    
    --radius-pill: 9999px;
    --radius-card: 18px;
    
    --shadow-project: 0 24px 48px rgba(0, 0, 0, 0.4), 0 8px 24px rgba(0, 0, 0, 0.3);
    
    --spacing-project-gap: 2.5rem;
    --spacing-project-row: 150px;
    
    --bento-gap: 1rem;
    --bento-card-bg: #1c1c1e;
    --bento-card-border: rgba(255, 255, 255, 0.06);
    --bento-card-hover-glow: rgba(255, 255, 255, 0.08);
    
    --ease-out: cubic-bezier(0.25, 0.1, 0.25, 1);
    --duration-slow: 1s;
    --duration-normal: 0.5s;
}

/* Light theme */
[data-theme="light"] {
    --color-bg: #f5f5f7;
    --color-bg-elevated: #ffffff;
    --color-bg-subtle: #e8e8ed;
    
    --color-text: #1d1d1f;
    --color-text-secondary: #6e6e73;
    --color-text-tertiary: #86868b;
    
    --color-border: #d2d2d7;
    
    --bento-card-bg: #ffffff;
    --bento-card-border: rgba(0, 0, 0, 0.08);
    --bento-card-hover-glow: rgba(0, 0, 0, 0.12);
    
    --shadow-project: 0 24px 48px rgba(0, 0, 0, 0.12), 0 8px 24px rgba(0, 0, 0, 0.08);
}

/* ========== Terminal-style Header (StarFetch style) ========== */
.terminal-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(13, 13, 13, 0.85);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
    transition: background 0.3s var(--ease-out), border-color 0.3s var(--ease-out);
}

[data-theme="light"] .terminal-header {
    background: rgba(245, 245, 247, 0.85);
}

.terminal-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.875rem var(--container-padding);
    max-width: var(--container-max);
    margin: 0 auto;
}

.terminal-controls {
    display: flex;
    gap: 0.5rem;
}

.control {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    border: 1px solid rgba(0, 0, 0, 0.1);
}

.control.close { background: #FF5F56; }
.control.minimize { background: #FFBD2E; }
.control.maximize { background: #27C93F; }

.terminal-title {
    font-size: 0.875rem;
    font-weight: 500;
    letter-spacing: 0.5px;
    color: var(--color-text);
}

.terminal-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-shrink: 0;
}

.btn-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.35rem;
    background: var(--color-bg-subtle);
    color: var(--color-text);
    border: 1px solid var(--color-border);
    padding: 0.5rem 0.75rem;
    min-height: 40px;
    border-radius: var(--radius-card);
    font-family: var(--font-sans);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.2s var(--ease-out), transform 0.2s var(--ease-out), box-shadow 0.2s var(--ease-out);
}

.btn-toggle:hover {
    background: var(--color-bg-elevated);
    transform: scale(1.03);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

[data-theme="light"] .btn-toggle:hover {
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.lang-selector {
    position: relative;
}

.lang-selector .btn-toggle {
    min-width: 88px;
}

.theme-icon,
.lang-icon {
    font-size: 1.2rem;
    line-height: 1;
}

.lang-text {
    font-size: 0.875rem;
    font-weight: 500;
}

.lang-dropdown {
    position: absolute;
    top: calc(100% + 0.35rem);
    right: 0;
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-card);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.35);
    min-width: 140px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity 0.25s var(--ease-out), visibility 0.25s var(--ease-out), transform 0.25s var(--ease-out);
    z-index: 1001;
    overflow: hidden;
}

[data-theme="light"] .lang-dropdown {
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
}

.lang-dropdown.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.lang-option {
    display: block;
    width: 100%;
    padding: 0.6rem 1rem;
    text-align: left;
    background: transparent;
    border: none;
    color: var(--color-text);
    font-family: var(--font-sans);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.2s var(--ease-out);
}

.lang-option:hover {
    background: var(--color-bg-subtle);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-sans);
    font-size: var(--font-size-body);
    line-height: var(--line-height-body);
    color: var(--color-text-secondary);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    padding-top: 3.5rem; /* space for fixed header */
}

/* ========== Layout Container ========== */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding-left: var(--container-padding);
    padding-right: var(--container-padding);
}

/* ========== Hero Section ========== */
.hero {
    min-height: 80vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

/* Dark abstract gradient + optional blurred “code” feel */
.hero::before {
    content: "";
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 80% 50% at 50% 0%, rgba(40, 40, 50, 0.4) 0%, transparent 55%),
        radial-gradient(ellipse 60% 40% at 80% 60%, rgba(30, 30, 45, 0.35) 0%, transparent 50%),
        radial-gradient(ellipse 50% 30% at 20% 70%, rgba(25, 25, 35, 0.3) 0%, transparent 45%),
        linear-gradient(180deg, var(--color-bg) 0%, var(--color-bg-elevated) 100%);
    z-index: 0;
    pointer-events: none;
}

/* Optional: very subtle “terminal/code” texture (no image required) */
.hero::after {
    content: "";
    position: absolute;
    inset: 0;
    background-image: 
        linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
    background-size: 60px 60px;
    opacity: 0.5;
    z-index: 0;
    pointer-events: none;
}

.hero .hero-inner {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: var(--container-max);
    padding: var(--container-padding);
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-hero-inner);
}

/* Eyebrow – small, subtle grey */
.hero-eyebrow {
    font-size: var(--font-size-eyebrow);
    font-weight: 500;
    letter-spacing: 0.02em;
    text-transform: uppercase;
    color: var(--color-text-secondary);
    opacity: 0;
    animation: heroFadeIn var(--duration-slow) var(--ease-out) 0.1s forwards;
}

/* Main headline – massive, gradient, tight */
.hero-headline {
    font-size: var(--font-size-hero-xl);
    font-weight: 800;
    letter-spacing: var(--letter-spacing-tighter);
    line-height: var(--line-height-tight);
    background: linear-gradient(180deg, #ffffff 0%, #a1a1a6 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    max-width: 16ch;
    margin: 0 auto;
    opacity: 0;
    animation: heroFadeIn var(--duration-slow) var(--ease-out) 0.25s forwards;
}

[data-theme="light"] .hero-headline {
    background: linear-gradient(180deg, #1d1d1f 0%, #6e6e73 100%);
    -webkit-background-clip: text;
    background-clip: text;
}

/* Sub-headline – legible grey */
.hero-subheadline {
    font-size: var(--font-size-subhead);
    font-weight: 400;
    line-height: var(--line-height-body);
    color: var(--color-text-secondary);
    max-width: 42ch;
    margin: 0 auto;
    opacity: 0;
    animation: heroFadeIn var(--duration-slow) var(--ease-out) 0.4s forwards;
}

@keyframes heroFadeIn {
    from {
        opacity: 0;
        transform: translateY(12px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ========== About & Hobby Sections ========== */
.about-section,
.hobby-section {
    padding: var(--spacing-section) 0;
}

.about-section__title {
    margin-bottom: 1.5rem;
}

.about-inner {
    display: flex;
    align-items: flex-start;
    gap: 2.5rem;
}

.about-content {
    flex: 1;
    min-width: 0;
}

.about-photo {
    flex-shrink: 0;
    width: 320px;
}

.about-photo__img {
    width: 100%;
    aspect-ratio: 1;
    display: block;
    border-radius: 50%;
    box-shadow: var(--shadow-project);
    object-fit: cover;
}

@media (max-width: 768px) {
    body {
        padding-top: 3rem;
    }

    .about-inner {
        flex-direction: column;
        gap: 2rem;
    }

    .about-photo {
        width: 100%;
        max-width: 320px;
        margin: 0 auto;
    }

    .hobby-sep {
        display: none;
    }

    .terminal-bar {
        padding-left: 1rem;
        padding-right: 1rem;
    }

    .terminal-title {
        font-size: 0.75rem;
        max-width: 14ch;
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
    }

    .btn-toggle {
        min-height: 44px;
        padding: 0.5rem 0.65rem;
    }

    .lang-selector .btn-toggle {
        min-width: 76px;
    }

    .footer-social {
        gap: 0.35rem 0.5rem;
    }

    .footer-social__link,
    .footer-social__sep {
        font-size: 0.8125rem;
    }
}

.section-title {
    font-size: clamp(1.5rem, 2.5vw, 2rem);
    font-weight: 700;
    letter-spacing: var(--letter-spacing-tight);
    color: var(--color-text);
    margin: 0 0 1.25rem;
}

.about-para,
.hobby-para {
    font-size: var(--font-size-body);
    line-height: var(--line-height-body);
    color: var(--color-text-secondary);
    margin: 0;
    max-width: 56ch;
}

.about-para + .about-para {
    margin-top: 1.25rem;
}

.hobby-links {
    margin: 1rem 0 0;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 0.35rem 0.6rem;
}

.hobby-link {
    color: var(--color-text);
    text-decoration: none;
    font-weight: 500;
    border-bottom: 1px solid var(--color-border);
    transition: border-color 0.2s var(--ease-out);
}

.hobby-link:hover {
    border-bottom-color: var(--color-text-tertiary);
}

.hobby-sep {
    margin: 0;
    color: var(--color-text-tertiary);
    font-size: 0.75rem;
}

/* ========== Competition & Experience Section ========== */
.comp-section {
    padding: var(--spacing-section) 0;
}

.comp-section__title {
    margin-bottom: 2rem;
}

.comp-block {
    margin-bottom: 2.5rem;
}

.comp-block:last-of-type {
    margin-bottom: 0;
}

.comp-block__label {
    font-size: 0.875rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--color-text-tertiary);
    margin: 0 0 0.75rem;
}

.comp-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.comp-list li {
    font-size: var(--font-size-body);
    line-height: 1.6;
    color: var(--color-text-secondary);
    padding: 0.35rem 0;
    padding-left: 1.25rem;
    position: relative;
}

.comp-list li::before {
    content: "·";
    position: absolute;
    left: 0;
    color: var(--color-text-tertiary);
}

/* ========== Footer ========== */
.portfolio-footer {
    padding: var(--spacing-section) 0;
    border-top: 1px solid var(--color-border);
    text-align: center;
}

.footer-contact-label {
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--color-text-tertiary);
    margin: 0 0 0.35rem;
}

.footer-email {
    margin: 0 0 1rem;
}

.footer-link {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: var(--font-size-body);
    border-bottom: 1px solid var(--color-border);
    transition: color 0.2s var(--ease-out), border-color 0.2s var(--ease-out);
}

.footer-link:hover {
    color: var(--color-text);
    border-bottom-color: var(--color-text-tertiary);
}

.footer-social {
    margin: 0 0 1rem;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 0.25rem;
}

.footer-social__link {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    transition: color 0.2s var(--ease-out);
}

.footer-social__link:hover {
    color: var(--color-text);
}

.footer-social__sep {
    color: var(--color-text-tertiary);
    font-size: 0.75rem;
}

.footer-copy {
    margin: 0;
    font-size: 0.875rem;
    color: var(--color-text-tertiary);
}

/* ========== Back to top ========== */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    z-index: 999;
    width: 2.75rem;
    height: 2.75rem;
    border-radius: 50%;
    border: 1px solid var(--color-border);
    background: var(--color-bg-subtle);
    color: var(--color-text);
    font-size: 1.25rem;
    line-height: 1;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(8px);
    transition: opacity 0.25s var(--ease-out), visibility 0.25s var(--ease-out), transform 0.25s var(--ease-out), background 0.2s var(--ease-out);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background: var(--color-bg-elevated);
}

@media (max-width: 768px) {
    .back-to-top {
        bottom: 1.5rem;
        right: 1.5rem;
        width: 2.5rem;
        height: 2.5rem;
        font-size: 1.1rem;
    }
}

/* ========== Core Projects Section ========== */
.core-projects {
    padding: var(--spacing-section) 0;
}

.project-row {
    margin-bottom: var(--spacing-project-row);
}

.project-row:last-child {
    margin-bottom: 0;
}

.project-row__inner {
    max-width: var(--container-max);
    margin: 0 auto;
    padding-left: var(--container-padding);
    padding-right: var(--container-padding);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-project-gap);
    align-items: center;
}

.project-block {
    min-width: 0;
}

.project-block--text {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
}

.project-headline {
    font-size: clamp(2rem, 4.5vw, 3rem);
    font-weight: 700;
    letter-spacing: var(--letter-spacing-tight);
    line-height: var(--line-height-tight);
    color: var(--color-text);
    margin: 0;
}

.project-subhead {
    font-size: var(--font-size-subhead);
    font-weight: 600;
    color: var(--color-text-secondary);
    margin: 0;
}

.project-body {
    font-size: var(--font-size-body);
    line-height: var(--line-height-body);
    color: var(--color-text-secondary);
    margin: 0;
    max-width: 42ch;
}

.project-link {
    display: inline-flex;
    align-items: center;
    gap: 0.35em;
    font-size: 1rem;
    font-weight: 500;
    color: var(--color-text);
    text-decoration: none;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-pill);
    background: var(--color-bg-subtle);
    border: 1px solid var(--color-border);
    transition: background 0.2s var(--ease-out), border-color 0.2s var(--ease-out), transform 0.2s var(--ease-out);
    margin-top: 0.25rem;
}

.project-link:hover {
    background: var(--color-bg-elevated);
    border-color: var(--color-text-tertiary);
    transform: translateX(4px);
}

.project-link:focus-visible {
    outline: 2px solid var(--color-text);
    outline-offset: 4px;
}

.project-block--media {
    position: relative;
    width: 100%;
    aspect-ratio: 3 / 2;
    border-radius: var(--radius-card);
    overflow: hidden;
    box-shadow: var(--shadow-project);
}

/* 仅 CauseLink：右栏内海报完整显示，不裁剪，保持两栏布局 */
.project-block--media--contain {
    aspect-ratio: auto;
    overflow: hidden;
    align-self: start;
    min-height: 0;
    border-radius: var(--radius-card);
}

.project-block--media--contain .project-image {
    width: 100%;
    height: auto;
    max-width: 100%;
    max-height: 85vh;
    object-fit: contain;
    display: block;
    border-radius: inherit;
}

.project-image {
    width: 100%;
    height: 100%;
    max-width: 100%;
    object-fit: cover;
    display: block;
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Responsive: stack on small screens */
@media (max-width: 768px) {
    .project-row__inner {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .project-block--text {
        order: 1;
    }

    .project-block--media {
        order: 2;
    }

    .project-row {
        margin-bottom: 4rem;
    }
}

/* ========== Skills & Experiences (Bento Grid) ========== */
.skills-section {
    padding: var(--spacing-section) 0;
}

.skills-section__title {
    font-size: clamp(1.75rem, 3vw, 2.25rem);
    font-weight: 700;
    letter-spacing: var(--letter-spacing-tight);
    color: var(--color-text);
    margin: 0 0 2rem;
    text-align: center;
}

.bento-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: auto auto auto;
    gap: var(--bento-gap);
    max-width: var(--container-max);
    margin: 0 auto;
}

/* Card 1: Large (2×2) */
.bento-card--large {
    grid-column: 1 / 3;
    grid-row: 1 / 3;
}

/* Card 2: Medium (2×1) */
#bento-role {
    grid-column: 3 / 5;
    grid-row: 1 / 2;
}

/* Card 3: Medium (2×1) */
#bento-awards {
    grid-column: 3 / 5;
    grid-row: 2 / 3;
}

/* Card 4 & 5: Small (1×1) */
#bento-volunteer {
    grid-column: 1 / 2;
    grid-row: 3 / 4;
}

#bento-art {
    grid-column: 2 / 3;
    grid-row: 3 / 4;
}

#bento-journey {
    grid-column: 3 / 5;
    grid-row: 3 / 4;
}

.bento-card {
    background: var(--bento-card-bg);
    border: 1px solid var(--bento-card-border);
    border-radius: var(--radius-card);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    transition: border-color 0.25s var(--ease-out), box-shadow 0.25s var(--ease-out);
}

.bento-card:hover {
    border-color: var(--bento-card-hover-glow);
    box-shadow: 0 0 0 1px var(--bento-card-hover-glow), 0 8px 32px rgba(0, 0, 0, 0.3);
}

.bento-card__label {
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--color-text-tertiary);
}

.bento-card__text {
    font-size: var(--font-size-body);
    line-height: var(--line-height-body);
    color: var(--color-text-secondary);
    margin: 0;
}

.bento-card__text strong {
    color: var(--color-text);
    font-weight: 600;
}

.bento-card__list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.bento-card__list--icons li {
    font-size: var(--font-size-body);
    line-height: 1.5;
    color: var(--color-text-secondary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.bento-card__list--icons li em {
    color: var(--color-text-tertiary);
    font-style: normal;
    font-size: 0.9em;
}

.bento-icon {
    font-style: normal;
    flex-shrink: 0;
}

/* Large card: more padding and spacing */
.bento-card--large {
    padding: 2rem;
    gap: 1rem;
}

.bento-card--large .bento-card__label {
    margin-bottom: 0.25rem;
}

.bento-card--large .bento-card__list {
    gap: 0.75rem;
}

.bento-card--large .bento-card__list li {
    font-size: 1.0625rem;
}

/* Medium cards: comfortable padding */
.bento-card--medium {
    padding: 1.5rem;
}

/* Small cards: compact */
.bento-card--small {
    padding: 1.25rem;
}

.bento-card--small .bento-card__text {
    font-size: 0.9375rem;
}

/* Bento grid: single column on small screens */
@media (max-width: 768px) {
    .bento-grid {
        grid-template-columns: 1fr;
        grid-template-rows: auto;
    }

    .bento-card--large,
    #bento-role,
    #bento-awards,
    #bento-volunteer,
    #bento-art,
    #bento-journey {
        grid-column: 1 / -1;
        grid-row: auto;
    }

    .bento-card {
        min-height: 0;
    }
}

/* Extra small screens: tighter padding, hero height */
@media (max-width: 480px) {
    :root {
        --container-padding: 1rem;
    }

    body {
        padding-top: 2.75rem;
    }

    .hero {
        min-height: 70vh;
    }

    .hero .hero-inner {
        padding-left: 1rem;
        padding-right: 1rem;
    }

    .terminal-bar {
        padding-left: 0.75rem;
        padding-right: 0.75rem;
    }

    .terminal-title {
        max-width: 12ch;
    }

    .section-title {
        font-size: 1.35rem;
    }

    .project-headline {
        font-size: clamp(1.5rem, 6vw, 2rem);
    }

    .project-link {
        padding: 0.65rem 1.25rem;
        min-height: 44px;
        display: inline-flex;
        align-items: center;
    }

    .back-to-top {
        bottom: 1.25rem;
        right: 1.25rem;
        width: 2.75rem;
        height: 2.75rem;
    }
}