/* ========================================
   PORTFOLIO STYLES - Part 1
   ======================================== */

:root {
    --color-bg: #fafafa;
    --color-bg-alt: #f0f0f0;
    --color-surface: #ffffff;
    --color-text: #1a1a2e;
    --color-text-light: #4a4a68;
    --color-text-muted: #8888a0;
    --color-accent: #6366f1;
    --color-accent-light: #818cf8;
    --color-accent-dark: #4f46e5;
    --color-accent-glow: rgba(99, 102, 241, 0.15);
    --color-border: #e5e5e5;
    --color-border-light: #f0f0f0;
    --gradient-primary: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-light) 100%);
    --gradient-hero: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'Fira Code', 'Consolas', monospace;
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    --spacing-4xl: 6rem;
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-2xl: 24px;
    --radius-full: 9999px;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.05), 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.08), 0 4px 10px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.1);
    --shadow-accent: 0 8px 30px rgba(99, 102, 241, 0.25);
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
    --container-max: 1200px;
    --header-height: 80px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: var(--header-height); }
body { font-family: var(--font-primary); font-size: 16px; line-height: 1.6; color: var(--color-text); background-color: var(--color-bg); -webkit-font-smoothing: antialiased; }
img { max-width: 100%; height: auto; display: block; }
a { text-decoration: none; color: inherit; }
button { border: none; background: none; cursor: pointer; font-family: inherit; }
ul, ol { list-style: none; }

.container { width: 100%; max-width: var(--container-max); margin: 0 auto; padding: 0 var(--spacing-lg); }
.section { padding: var(--spacing-4xl) 0; }
.section__title { font-size: clamp(1.75rem, 4vw, 2.5rem); font-weight: 700; margin-bottom: var(--spacing-3xl); text-align: center; }
.section__title-accent { color: var(--color-accent); font-family: var(--font-mono); }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: var(--spacing-sm); padding: var(--spacing-md) var(--spacing-xl); font-size: 0.95rem; font-weight: 500; border-radius: var(--radius-lg); transition: all var(--transition-base); cursor: pointer; }
.btn__icon { width: 18px; height: 18px; transition: transform var(--transition-base); }
.btn--primary { background: var(--gradient-primary); color: white; box-shadow: var(--shadow-accent); }
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 12px 35px rgba(99, 102, 241, 0.35); }
.btn--primary:hover .btn__icon { transform: translateX(4px); }
.btn--outline { background: transparent; color: var(--color-text); border: 2px solid var(--color-border); }
.btn--outline:hover { border-color: var(--color-accent); color: var(--color-accent); background: var(--color-accent-glow); }
.btn--large { padding: var(--spacing-lg) var(--spacing-2xl); font-size: 1rem; }

.header { position: fixed; top: 0; left: 0; right: 0; height: var(--header-height); background: rgba(250, 250, 250, 0.9); backdrop-filter: blur(10px); border-bottom: 1px solid var(--color-border-light); z-index: 1000; transition: all var(--transition-base); }
.header--scrolled { box-shadow: var(--shadow-md); }
.nav { display: flex; align-items: center; justify-content: space-between; height: 100%; }
.nav__logo { font-size: 1.5rem; font-weight: 700; color: var(--color-text); transition: color var(--transition-fast); }
.nav__logo-accent { color: var(--color-accent); }
.nav__logo:hover { color: var(--color-accent); }
.nav__menu { display: flex; align-items: center; gap: var(--spacing-xl); }
.nav__link { font-size: 0.95rem; font-weight: 500; color: var(--color-text-light); padding: var(--spacing-sm) 0; position: relative; transition: color var(--transition-fast); }
.nav__link::after { content: ''; position: absolute; bottom: 0; left: 0; width: 0; height: 2px; background: var(--color-accent); transition: width var(--transition-base); }
.nav__link:hover { color: var(--color-accent); }
.nav__link:hover::after { width: 100%; }
.nav__link--cta { background: var(--gradient-primary); color: white !important; padding: var(--spacing-sm) var(--spacing-lg); border-radius: var(--radius-full); }
.nav__link--cta::after { display: none; }
.nav__link--cta:hover { transform: translateY(-2px); box-shadow: var(--shadow-accent); }
.nav__toggle { display: none; flex-direction: column; gap: 5px; padding: var(--spacing-sm); z-index: 1001; }
.nav__toggle-bar { width: 24px; height: 2px; background: var(--color-text); border-radius: 2px; transition: all var(--transition-base); }

.hero { min-height: 100vh; display: flex; align-items: center; position: relative; padding-top: var(--header-height); background: linear-gradient(180deg, var(--color-bg) 0%, var(--color-bg-alt) 100%); overflow: hidden; }
.hero::before { content: ''; position: absolute; top: -50%; right: -20%; width: 600px; height: 600px; background: radial-gradient(circle, var(--color-accent-glow) 0%, transparent 70%); border-radius: 50%; opacity: 0.6; }
.hero__container { display: grid; grid-template-columns: 1fr 1fr; gap: var(--spacing-4xl); align-items: center; }
.hero__content { z-index: 1; }
.hero__greeting { font-size: 1.1rem; color: var(--color-accent); font-weight: 500; margin-bottom: var(--spacing-sm); font-family: var(--font-mono); }
.hero__name { font-size: clamp(2.5rem, 6vw, 4rem); font-weight: 700; line-height: 1.1; margin-bottom: var(--spacing-md); background: var(--gradient-hero); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero__title { font-size: clamp(1.25rem, 3vw, 1.75rem); font-weight: 500; color: var(--color-text-light); margin-bottom: var(--spacing-lg); }
.hero__tagline { font-size: 1.1rem; color: var(--color-text-muted); max-width: 450px; margin-bottom: var(--spacing-2xl); }
.hero__buttons { display: flex; gap: var(--spacing-md); flex-wrap: wrap; }

.hero__visual { display: flex; justify-content: center; z-index: 1; }
.hero__code-block { background: #1e1e2e; border-radius: var(--radius-xl); padding: var(--spacing-lg); box-shadow: var(--shadow-xl); max-width: 380px; width: 100%; transform: perspective(800px) rotateY(-5deg) rotateX(5deg); transition: transform var(--transition-slow); }
.hero__code-block:hover { transform: perspective(800px) rotateY(0) rotateX(0); }
.code-block__header { display: flex; gap: 8px; margin-bottom: var(--spacing-md); }
.code-block__dot { width: 12px; height: 12px; border-radius: 50%; }
.code-block__dot--red { background: #ff5f57; }
.code-block__dot--yellow { background: #febc2e; }
.code-block__dot--green { background: #28c840; }
.code-block__content { font-family: var(--font-mono); font-size: 0.9rem; line-height: 1.8; color: #cdd6f4; overflow-x: auto; }
.code--keyword { color: #cba6f7; }
.code--variable { color: #89b4fa; }
.code--property { color: #94e2d5; }
.code--string { color: #a6e3a1; }
.hero__scroll-indicator { position: absolute; bottom: var(--spacing-2xl); left: 50%; transform: translateX(-50%); display: flex; flex-direction: column; align-items: center; gap: var(--spacing-sm); color: var(--color-text-muted); font-size: 0.8rem; text-transform: uppercase; letter-spacing: 2px; transition: color var(--transition-fast); }
.hero__scroll-indicator:hover { color: var(--color-accent); }
.hero__scroll-line { width: 1px; height: 40px; background: linear-gradient(180deg, var(--color-accent), transparent); animation: scrollPulse 2s ease-in-out infinite; }
@keyframes scrollPulse { 0%, 100% { opacity: 0.3; transform: scaleY(0.8); } 50% { opacity: 1; transform: scaleY(1); } }

.about__content { display: grid; grid-template-columns: 2fr 1fr; gap: var(--spacing-4xl); align-items: start; }
.about__text p { font-size: 1.05rem; color: var(--color-text-light); margin-bottom: var(--spacing-lg); line-height: 1.8; }
.about__text strong { color: var(--color-text); }
.about__stats { display: flex; flex-direction: column; gap: var(--spacing-lg); }
.about__stat { background: var(--color-surface); padding: var(--spacing-xl); border-radius: var(--radius-lg); text-align: center; box-shadow: var(--shadow-md); border: 1px solid var(--color-border-light); transition: all var(--transition-base); }
.about__stat:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: var(--color-accent); }
.about__stat-number { display: block; font-size: 2.5rem; font-weight: 700; color: var(--color-accent); line-height: 1; margin-bottom: var(--spacing-xs); }
.about__stat-label { font-size: 0.85rem; color: var(--color-text-muted); text-transform: uppercase; letter-spacing: 1px; }

.skills { background: var(--color-bg-alt); }
.skills__grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--spacing-xl); }
.skills__category { background: var(--color-surface); padding: var(--spacing-xl); border-radius: var(--radius-xl); box-shadow: var(--shadow-md); border: 1px solid var(--color-border-light); transition: all var(--transition-base); }
.skills__category:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.skills__category-header { display: flex; align-items: center; gap: var(--spacing-md); margin-bottom: var(--spacing-lg); }
.skills__category-icon { width: 48px; height: 48px; display: flex; align-items: center; justify-content: center; background: var(--color-accent-glow); border-radius: var(--radius-lg); color: var(--color-accent); }
.skills__category-icon svg { width: 24px; height: 24px; }
.skills__category-title { font-size: 1.25rem; font-weight: 600; }
.skills__tags { display: flex; flex-wrap: wrap; gap: var(--spacing-sm); }
.skill-tag { display: inline-block; padding: var(--spacing-sm) var(--spacing-md); background: var(--color-bg-alt); color: var(--color-text-light); font-size: 0.85rem; font-weight: 500; border-radius: var(--radius-full); transition: all var(--transition-fast); }
.skill-tag:hover { background: var(--color-accent-glow); color: var(--color-accent); }
.skill-tag--highlight { background: var(--color-accent-glow); color: var(--color-accent); }

.projects__grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--spacing-xl); }
.project-card { background: var(--color-surface); padding: var(--spacing-xl); border-radius: var(--radius-xl); box-shadow: var(--shadow-md); border: 1px solid var(--color-border-light); transition: all var(--transition-base); display: flex; flex-direction: column; }
.project-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-xl); border-color: var(--color-accent); }
.project-card__header { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: var(--spacing-lg); }
.project-card__icon { width: 48px; height: 48px; display: flex; align-items: center; justify-content: center; background: var(--color-accent-glow); border-radius: var(--radius-lg); color: var(--color-accent); }
.project-card__icon svg { width: 24px; height: 24px; }
.project-card__badge { font-size: 0.75rem; font-weight: 600; text-transform: uppercase; letter-spacing: 1px; color: var(--color-accent); background: var(--color-accent-glow); padding: var(--spacing-xs) var(--spacing-sm); border-radius: var(--radius-full); }
.project-card__title { font-size: 1.25rem; font-weight: 600; margin-bottom: var(--spacing-md); color: var(--color-text); }
.project-card__description { font-size: 0.95rem; color: var(--color-text-light); line-height: 1.7; margin-bottom: var(--spacing-lg); flex-grow: 1; }
.project-card__tags { display: flex; flex-wrap: wrap; gap: var(--spacing-xs); margin-bottom: var(--spacing-lg); }
.project-tag { font-size: 0.75rem; font-weight: 500; color: var(--color-text-muted); background: var(--color-bg-alt); padding: var(--spacing-xs) var(--spacing-sm); border-radius: var(--radius-sm); }
.project-card__link { display: inline-flex; align-items: center; gap: var(--spacing-sm); font-size: 0.9rem; font-weight: 600; color: var(--color-accent); transition: all var(--transition-fast); }
.project-card__link svg { width: 16px; height: 16px; transition: transform var(--transition-fast); }
.project-card__link:hover { color: var(--color-accent-dark); }
.project-card__link:hover svg { transform: translateX(4px); }

.contact { background: var(--color-bg-alt); }
.contact__content { display: grid; grid-template-columns: 1fr 1fr; gap: var(--spacing-4xl); align-items: start; }
.contact__text { font-size: 1.1rem; color: var(--color-text-light); line-height: 1.8; margin-bottom: var(--spacing-2xl); }
.contact__details { margin-bottom: var(--spacing-xl); }
.contact__item { display: flex; align-items: center; gap: var(--spacing-md); padding: var(--spacing-md); background: var(--color-surface); border-radius: var(--radius-lg); margin-bottom: var(--spacing-md); transition: all var(--transition-base); }
.contact__item:hover { transform: translateX(8px); box-shadow: var(--shadow-md); }
.contact__item-icon { width: 48px; height: 48px; display: flex; align-items: center; justify-content: center; background: var(--color-accent-glow); border-radius: var(--radius-lg); color: var(--color-accent); }
.contact__item-icon svg { width: 24px; height: 24px; }
.contact__item-label { display: block; font-size: 0.8rem; color: var(--color-text-muted); text-transform: uppercase; letter-spacing: 1px; }
.contact__item-value { font-weight: 500; color: var(--color-text); }
.contact__social { display: flex; gap: var(--spacing-md); }
.contact__social-link { width: 48px; height: 48px; display: flex; align-items: center; justify-content: center; background: var(--color-surface); border-radius: var(--radius-lg); color: var(--color-text-light); transition: all var(--transition-base); }
.contact__social-link svg { width: 22px; height: 22px; }
.contact__social-link:hover { background: var(--color-accent); color: white; transform: translateY(-4px); box-shadow: var(--shadow-accent); }
.contact__cta-card { background: var(--gradient-primary); padding: var(--spacing-3xl); border-radius: var(--radius-2xl); text-align: center; color: white; box-shadow: var(--shadow-accent); }
.contact__cta-title { font-size: 1.75rem; font-weight: 700; margin-bottom: var(--spacing-md); }
.contact__cta-text { font-size: 1rem; opacity: 0.9; margin-bottom: var(--spacing-xl); }
.contact__cta-card .btn--primary { background: white; color: var(--color-accent); box-shadow: var(--shadow-md); }
.contact__cta-card .btn--primary:hover { background: var(--color-bg); box-shadow: var(--shadow-lg); }

.footer { background: var(--color-text); color: white; padding: var(--spacing-xl) 0; }
.footer__content { display: flex; justify-content: space-between; align-items: center; }
.footer__text { font-size: 0.9rem; color: rgba(255, 255, 255, 0.7); }
.footer__back-top { display: inline-flex; align-items: center; gap: var(--spacing-sm); font-size: 0.85rem; color: rgba(255, 255, 255, 0.7); transition: color var(--transition-fast); }
.footer__back-top svg { width: 16px; height: 16px; }
.footer__back-top:hover { color: var(--color-accent-light); }

.back-to-top { position: fixed; bottom: var(--spacing-xl); right: var(--spacing-xl); width: 48px; height: 48px; background: var(--gradient-primary); color: white; border-radius: var(--radius-lg); display: flex; align-items: center; justify-content: center; box-shadow: var(--shadow-accent); opacity: 0; visibility: hidden; transform: translateY(20px); transition: all var(--transition-base); z-index: 999; }
.back-to-top svg { width: 20px; height: 20px; }
.back-to-top--visible { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top:hover { transform: translateY(-4px); box-shadow: 0 12px 35px rgba(99, 102, 241, 0.4); }

.reveal { opacity: 0; transform: translateY(30px); transition: all 0.8s cubic-bezier(0.5, 0, 0, 1); }
.reveal--visible { opacity: 1; transform: translateY(0); }

@media (max-width: 992px) {
    .hero__container { grid-template-columns: 1fr; text-align: center; }
    .hero__tagline { margin-left: auto; margin-right: auto; }
    .hero__buttons { justify-content: center; }
    .hero__visual, .hero__scroll-indicator { display: none; }
    .about__content { grid-template-columns: 1fr; }
    .about__stats { flex-direction: row; justify-content: center; }
    .contact__content { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
    :root { --header-height: 70px; }
    .section { padding: var(--spacing-3xl) 0; }
    .nav__menu { position: fixed; top: 0; right: -100%; width: 70%; height: 100vh; background: var(--color-surface); flex-direction: column; justify-content: center; gap: var(--spacing-xl); box-shadow: -10px 0 30px rgba(0, 0, 0, 0.1); transition: right var(--transition-base); }
    .nav__menu--open { right: 0; }
    .nav__link--cta { margin-top: var(--spacing-md); }
    .nav__toggle { display: flex; }
    .nav__toggle--active .nav__toggle-bar:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
    .nav__toggle--active .nav__toggle-bar:nth-child(2) { opacity: 0; }
    .nav__toggle--active .nav__toggle-bar:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }
    .skills__grid, .projects__grid { grid-template-columns: 1fr; }
    .about__stats { flex-direction: column; }
    .footer__content { flex-direction: column; gap: var(--spacing-md); text-align: center; }
    .back-to-top { bottom: var(--spacing-md); right: var(--spacing-md); width: 44px; height: 44px; }
}

@media (max-width: 480px) {
    .container { padding: 0 var(--spacing-md); }
    .hero__name { font-size: 2rem; }
    .hero__buttons { flex-direction: column; width: 100%; }
    .btn { width: 100%; }
    .project-card { padding: var(--spacing-lg); }
}