/* =====================================================
   iOS Developer Portfolio - Premium Apple-Style Design
   ===================================================== */

/* CSS Variables */
:root {
    /* Colors - Strict B&W palette */
    --color-black: #000000;
    --color-dark: #111111;
    --color-gray-900: #1c1c1e;
    --color-gray-800: #2c2c2e;
    --color-gray-600: #48484a;
    --color-gray-400: #636366;
    --color-gray-200: #d1d1d6;
    --color-gray-100: #e5e5ea;
    --color-light: #f5f5f7;
    --color-white: #ffffff;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;
    --font-size-5xl: 3.5rem;

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 3rem;
    --space-4xl: 4rem;
    --space-5xl: 5rem;

    /* Layout */
    --max-width: 1200px;
    --header-height: 64px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;

    /* Border radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
}

/* 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-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-dark);
    background-color: var(--color-white);
}

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

ul {
    list-style: none;
}

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

/* Focus states for accessibility */
:focus-visible {
    outline: 2px solid var(--color-black);
    outline-offset: 2px;
}

/* Selection */
::selection {
    background-color: var(--color-black);
    color: var(--color-white);
}

/* =====================================================
   Header & Navigation
   ===================================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background-color: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    z-index: 1000;
    transition: background-color var(--transition-base), box-shadow var(--transition-base);
}

.header.scrolled {
    background-color: rgba(255, 255, 255, 0.95);
    box-shadow: 0 1px 0 rgba(0, 0, 0, 0.08);
}

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

.nav-logo {
    font-size: var(--font-size-lg);
    font-weight: 600;
    letter-spacing: -0.02em;
    transition: opacity var(--transition-fast);
}

.nav-logo:hover {
    opacity: 0.7;
}

.nav-links {
    display: flex;
    gap: var(--space-xl);
}

.nav-links a {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-gray-600);
    transition: color var(--transition-fast);
}

.nav-links a:hover {
    color: var(--color-black);
}

/* =====================================================
   Hero Section
   ===================================================== */
.hero {
    min-height: auto;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-4xl) var(--space-xl);
    padding-top: calc(var(--header-height) + var(--space-4xl));
}

.hero-content {
    max-width: 800px;
    text-align: center;
}

/* Hero Photo */
.hero-photo {
    width: 140px;
    height: 140px;
    margin: 0 auto var(--space-2xl);
    border-radius: 50%;
    overflow: hidden;
    background-color: var(--color-light);
    opacity: 0;
    transform: translateY(20px) scale(0.9);
    animation: fadeInUp 0.6s ease forwards;
}

.hero-photo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hero-title {
    font-size: clamp(var(--font-size-3xl), 8vw, var(--font-size-5xl));
    font-weight: 600;
    letter-spacing: -0.03em;
    line-height: 1.1;
    margin-bottom: var(--space-lg);
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.6s ease forwards;
}

.hero-subtitle {
    font-size: clamp(var(--font-size-lg), 2.5vw, var(--font-size-xl));
    color: var(--color-gray-600);
    line-height: 1.5;
    max-width: 600px;
    margin: 0 auto var(--space-2xl);
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.6s ease 0.1s forwards;
}

.hero-cta {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
    flex-wrap: wrap;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.6s ease 0.2s forwards;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-md) var(--space-xl);
    font-size: var(--font-size-sm);
    font-weight: 500;
    border-radius: var(--radius-xl);
    transition: all var(--transition-base);
    cursor: pointer;
    border: none;
}

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

.btn-primary:hover {
    background-color: var(--color-gray-800);
    transform: scale(1.02);
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-black);
    border: 1px solid var(--color-gray-200);
}

.btn-secondary:hover {
    background-color: var(--color-light);
    border-color: var(--color-gray-400);
}

/* =====================================================
   Work Section
   ===================================================== */
.work {
    padding: var(--space-4xl) var(--space-xl);
    background-color: var(--color-light);
}

.section-header {
    max-width: var(--max-width);
    margin: 0 auto var(--space-2xl);
}

.section-title {
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-gray-400);
}

/* App Card - Full width layout */
.app-card {
    max-width: var(--max-width);
    margin: 0 auto var(--space-3xl);
    padding: var(--space-2xl);
    background-color: var(--color-white);
    border-radius: var(--radius-lg);
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.app-card.visible {
    opacity: 1;
    transform: translateY(0);
}

.app-card:last-child {
    margin-bottom: 0;
}

.app-info {
    margin-bottom: var(--space-xl);
}

.app-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--space-xl);
    margin-bottom: var(--space-lg);
}

.app-title-group {
    flex: 1;
}

.app-name {
    font-size: var(--font-size-4xl);
    font-weight: 600;
    letter-spacing: -0.02em;
    margin-bottom: var(--space-sm);
}

.app-tagline {
    display: block;
    font-size: var(--font-size-xl);
    color: var(--color-gray-600);
    line-height: 1.4;
}

.app-links {
    flex-shrink: 0;
}

.app-details {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-sm) var(--space-xl);
    margin-bottom: 0;
}

.app-details li {
    padding: var(--space-md) 0;
    border-bottom: 1px solid var(--color-gray-100);
    font-size: var(--font-size-base);
    color: var(--color-gray-800);
    line-height: 1.5;
}

.detail-label {
    display: block;
    width: auto;
    font-weight: 600;
    color: var(--color-gray-400);
    font-size: var(--font-size-xs);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: var(--space-xs);
}

.app-links {
    display: flex;
    gap: var(--space-md);
}

.app-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-black);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.app-link:hover {
    background-color: var(--color-black);
    color: var(--color-white);
    border-color: var(--color-black);
}

.app-link svg {
    flex-shrink: 0;
}

/* App Screenshots Gallery - Horizontal scroll */
.app-preview {
    width: 100%;
    margin: 0 calc(-1 * var(--space-3xl));
    padding: 0 var(--space-3xl);
    width: calc(100% + var(--space-3xl) * 2);
}

.app-screenshots {
    display: flex;
    gap: var(--space-xl);
    overflow-x: auto;
    padding: var(--space-xl) var(--space-md);
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
    scrollbar-color: var(--color-gray-200) transparent;
}

.app-screenshots::-webkit-scrollbar {
    height: 6px;
}

.app-screenshots::-webkit-scrollbar-track {
    background: transparent;
}

.app-screenshots::-webkit-scrollbar-thumb {
    background-color: var(--color-gray-200);
    border-radius: 3px;
}

.app-screenshots::-webkit-scrollbar-thumb:hover {
    background-color: var(--color-gray-400);
}

.phone-mockup {
    position: relative;
    flex-shrink: 0;
    width: 220px;
    padding: 10px;
    background: var(--color-dark);
    border-radius: 32px;
    box-shadow:
        0 25px 50px -12px rgba(0, 0, 0, 0.2),
        0 12px 24px -12px rgba(0, 0, 0, 0.15),
        inset 0 0 0 1px rgba(255, 255, 255, 0.1);
    transition: transform var(--transition-slow);
    scroll-snap-align: start;
}

.phone-mockup:hover {
    transform: translateY(-8px) scale(1.02);
}

.phone-mockup img {
    width: 100%;
    border-radius: 24px;
    display: block;
}

/* Ensure at least 4 mockups visible hint */
.app-screenshots::after {
    content: '';
    flex-shrink: 0;
    width: var(--space-md);
}

/* =====================================================
   About Section
   ===================================================== */
.about {
    padding: var(--space-4xl) var(--space-xl);
    background-color: var(--color-white);
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
}

.about .section-title {
    margin-bottom: var(--space-2xl);
}

.about-text {
    margin-bottom: var(--space-3xl);
}

.about-intro {
    font-size: var(--font-size-2xl) !important;
    font-weight: 600;
    color: var(--color-black) !important;
    letter-spacing: -0.02em;
}

.about-text p {
    font-size: var(--font-size-lg);
    color: var(--color-gray-800);
    line-height: 1.7;
    margin-bottom: var(--space-lg);
}

.about-text p:last-child {
    margin-bottom: 0;
}

.skills-title {
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-gray-400);
    margin-bottom: var(--space-lg);
}

.skills-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.skills-list li {
    padding: var(--space-sm) var(--space-md);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-gray-800);
    background-color: var(--color-light);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.skills-list li:hover {
    background-color: var(--color-black);
    color: var(--color-white);
}

/* =====================================================
   Contact Section
   ===================================================== */
.contact {
    padding: var(--space-4xl) var(--space-xl);
    background-color: var(--color-dark);
    color: var(--color-white);
}

.contact-content {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.contact .section-title {
    color: var(--color-gray-400);
    margin-bottom: var(--space-lg);
}

.contact-text {
    font-size: var(--font-size-xl);
    color: var(--color-gray-200);
    margin-bottom: var(--space-xl);
}

.contact-email {
    display: inline-block;
    font-size: clamp(var(--font-size-xl), 4vw, var(--font-size-3xl));
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--color-white);
    position: relative;
    transition: opacity var(--transition-fast);
}

.contact-email::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--color-white);
    transform: scaleX(0);
    transform-origin: right;
    transition: transform var(--transition-base);
}

.contact-email:hover::after {
    transform: scaleX(1);
    transform-origin: left;
}

.contact-links {
    margin-top: var(--space-2xl);
    display: flex;
    gap: var(--space-lg);
    justify-content: center;
}

.contact-links a {
    font-size: var(--font-size-sm);
    color: var(--color-gray-400);
    transition: color var(--transition-fast);
}

.contact-links a:hover {
    color: var(--color-white);
}

/* =====================================================
   Footer
   ===================================================== */
.footer {
    padding: var(--space-xl);
    background-color: var(--color-black);
    text-align: center;
}

.footer p {
    font-size: var(--font-size-xs);
    color: var(--color-gray-600);
}

/* =====================================================
   Animations
   ===================================================== */
@keyframes fadeInUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* =====================================================
   Responsive Design
   ===================================================== */
@media (max-width: 968px) {
    .app-card {
        padding: var(--space-2xl);
    }

    .app-name {
        font-size: var(--font-size-3xl);
    }

    .app-tagline {
        font-size: var(--font-size-lg);
    }

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

    .app-preview {
        margin: 0 calc(-1 * var(--space-2xl));
        padding: 0 var(--space-2xl);
        width: calc(100% + var(--space-2xl) * 2);
    }

    .phone-mockup {
        width: 180px;
        padding: 8px;
        border-radius: 28px;
    }

    .phone-mockup img {
        border-radius: 20px;
    }
}

@media (max-width: 768px) {
    :root {
        --header-height: 56px;
    }

    .nav {
        padding: 0 var(--space-md);
    }

    .nav-links {
        gap: var(--space-lg);
    }

    .nav-links a {
        font-size: var(--font-size-xs);
    }

    .hero {
        padding: var(--space-3xl) var(--space-md);
        padding-top: calc(var(--header-height) + var(--space-3xl));
    }

    .hero-photo {
        width: 120px;
        height: 120px;
    }

    .work,
    .about,
    .contact {
        padding: var(--space-3xl) var(--space-md);
    }

    .app-card {
        margin-bottom: var(--space-3xl);
        padding: var(--space-xl);
    }

    .app-header {
        flex-direction: column;
        gap: var(--space-md);
    }

    .app-links {
        align-self: flex-start;
    }

    .app-name {
        font-size: var(--font-size-2xl);
    }

    .app-tagline {
        font-size: var(--font-size-base);
    }

    .app-details {
        grid-template-columns: 1fr;
        gap: 0;
    }

    .app-preview {
        margin: 0 calc(-1 * var(--space-xl));
        padding: 0 var(--space-xl);
        width: calc(100% + var(--space-xl) * 2);
    }

    .phone-mockup {
        width: 160px;
        padding: 7px;
        border-radius: 24px;
    }

    .phone-mockup img {
        border-radius: 18px;
    }
}

@media (max-width: 480px) {
    .hero-cta {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 280px;
    }

    .app-card {
        padding: var(--space-lg);
    }

    .app-preview {
        margin: 0 calc(-1 * var(--space-lg));
        padding: 0 var(--space-lg);
        width: calc(100% + var(--space-lg) * 2);
    }

    .app-screenshots {
        gap: var(--space-md);
    }

    .phone-mockup {
        width: 140px;
        padding: 6px;
        border-radius: 20px;
    }

    .phone-mockup img {
        border-radius: 15px;
    }

    .skills-list {
        justify-content: center;
    }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    html {
        scroll-behavior: auto;
    }
}