/* ============================================================
   css/style.css — Main stylesheet
   Uses CSS custom properties (design tokens) throughout.
   Edit the :root block to retheme the entire site.
   ============================================================ */

/* ─── DESIGN TOKENS ──────────────────────────────────────── */
:root {
    /* Colors */
    --color-bg: #0d1117;
    --color-bg-raised: #161b22;
    --color-bg-card: #21262d;
    --color-accent: #178cc4;
    --color-accent-dim: rgba(23, 140, 196, 0.45);
    --color-purple: #3015c7;
    --color-text: #e6edf3;
    --color-text-muted: #8b949e;
    --color-border: rgba(255, 255, 255, 0.1);
    --color-heart: #ff0026;

    /* Gradient */
    --gradient-accent: linear-gradient(135deg, var(--color-purple), var(--color-accent));

    /* Typography */
    --font: 'Poppins', system-ui, -apple-system, sans-serif;
    --text-xs: clamp(0.70rem, 1.5vw, 0.80rem);
    --text-sm: clamp(0.80rem, 1.8vw, 0.90rem);
    --text-base: clamp(0.875rem, 2vw, 1rem);
    --text-lg: clamp(1rem, 2.5vw, 1.125rem);
    --text-xl: clamp(1.125rem, 3vw, 1.375rem);
    --text-2xl: clamp(1.5rem, 4vw, 2rem);
    --text-hero: clamp(2rem, 5.5vw, 3.75rem);

    /* Spacing (base-4 scale) */
    --sp-1: 0.25rem;
    --sp-2: 0.5rem;
    --sp-3: 0.75rem;
    --sp-4: 1rem;
    --sp-6: 1.5rem;
    --sp-8: 2rem;
    --sp-10: 2.5rem;
    --sp-12: 3rem;
    --sp-16: 4rem;
    --sp-20: 5rem;

    /* Layout */
    --container-px: clamp(1rem, 8vw, 8rem);
    --section-gap: clamp(3rem, 8vw, 5rem);
    --nav-height: 60px;

    /* Radii */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-full: 9999px;

    /* Transitions */
    --t-fast: 150ms ease;
    --t-base: 300ms ease;
    --t-slow: 500ms ease;
}

/* ─── RESET ──────────────────────────────────────────────── */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

@media (prefers-reduced-motion: no-preference) {
    html {
        scroll-behavior: smooth;
    }
}

html {
    scroll-padding-top: var(--nav-height);
}

body {
    font-family: var(--font), sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    overflow-x: hidden;
    font-size: var(--text-base);
}

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

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

ul, ol {
    list-style: none;
}

button {
    font-family: var(--font), sans-serif;
    cursor: pointer;
}

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

/* ─── UTILITY ────────────────────────────────────────────── */
.container {
    width: 100%;
    max-width: 1600px;
    margin-inline: auto;
    padding-inline: var(--container-px);
}

.hidden {
    display: none !important;
}

.section-title {
    font-size: var(--text-2xl);
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--sp-12);
}

/* ─── BUTTONS ────────────────────────────────────────────── */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--sp-2);
    padding: 0.75rem 2.5rem;
    border: 1px solid var(--color-purple);
    border-radius: var(--radius-sm);
    color: var(--color-text);
    font-size: var(--text-base);
    font-weight: 500;
    background: transparent;
    cursor: pointer;
    text-decoration: none;
    transition: background var(--t-base), border-color var(--t-base);
}

.btn:hover {
    background: var(--color-accent);
    border-color: var(--color-accent);
}

.btn-primary {
    background: var(--color-accent);
    border-color: var(--color-accent);
}

.btn-primary:hover {
    background: var(--color-purple);
    border-color: var(--color-purple);
}

/* ─── PAGE TOP (lang switcher row) ──────────────────────── */
#page-top {
    display: flex;
    align-items: center;
    padding: var(--sp-4) var(--container-px);
    height: var(--nav-height);
    animation: fadeIn 4s;
}

/* ─── LANG SWITCHER ─────────────────────────────────────── */
.lang-switcher {
    display: flex;
    gap: var(--sp-3);
    align-items: center;
}

.lang-btn {
    display: flex;
    align-items: center;
    gap: var(--sp-2);
    background: none;
    border: none;
    color: var(--color-text);
    font-size: var(--text-sm);
    padding: var(--sp-2) var(--sp-3);
    border-radius: var(--radius-sm);
    opacity: 0.55;
    transition: opacity var(--t-fast), transform var(--t-fast), background var(--t-fast);
}

.lang-btn:hover {
    opacity: 1;
    transform: scale(1.05);
}

.lang-btn.active {
    opacity: 1;
    background: var(--color-bg-card);
}

.lang-flag {
    width: 26px;
    height: auto;
    border-radius: 2px;
}

.lang-label {
    display: none;
}

/* shown at ≥800 px via responsive.css */

/* ─── NAVIGATION ─────────────────────────────────────────── */
#main-nav {
    position: fixed;
    top: 1rem;
    right: var(--container-px);
    z-index: 100;
    display: flex;
    align-items: center;
    gap: var(--sp-4);
    border-radius: var(--radius-md);
    padding: var(--sp-3) var(--sp-4);
    transition: background var(--t-base), backdrop-filter var(--t-base);
}

#main-nav.scrolled {
    background: rgba(9, 9, 39, 0.92);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

#nav-list {
    display: flex;
    gap: var(--sp-6);
}

#nav-list a {
    font-size: var(--text-lg);
    color: var(--color-text);
    position: relative;
    transition: color var(--t-fast);
}

#nav-list a::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: -4px;
    width: 0;
    height: 2px;
    background: var(--color-accent);
    transition: width var(--t-base);
}

#nav-list a:hover::after,
#nav-list a.active::after {
    width: 100%;
}

/* Hamburger button (hidden on desktop) */
.menu-btn {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    padding: var(--sp-2);
    z-index: 110;
    position: relative;
}

.menu-line {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: transform var(--t-slow), opacity var(--t-base);
}

/* ─── BACK TO TOP ────────────────────────────────────────── */
.back-to-top {
    display: none;
    position: fixed;
    bottom: var(--sp-6);
    right: var(--sp-8);
    z-index: 50;
    font-size: 1.6rem;
    color: var(--color-text-muted);
    transition: color var(--t-base), transform var(--t-base);
}

.back-to-top.visible {
    display: block;
    animation: fadeIn 0.3s ease;
}

.back-to-top:hover {
    color: var(--color-purple);
    transform: translateY(-5px);
}

/* ─── HERO SECTION ───────────────────────────────────────── */
#hero {
    min-height: 90vh;
    padding-top: var(--sp-4);
}

.hero-grid {
    display: grid;
    grid-template-columns: minmax(auto, 600px) 1fr;
    justify-content: space-between;
    align-items: center;
    min-height: 80vh;
    gap: var(--sp-8);
    max-width: 1600px;
    margin-inline: auto;
}

.hero-text {
    z-index: 2;
    padding-top: var(--sp-6);
    animation: slideDownTextOpaque 2s ease-out;
}

.hero-subtitle {
    font-size: var(--text-xl);
    color: var(--color-text-muted);
    margin-bottom: var(--sp-3);
}

.hero-title {
    font-size: var(--text-hero);
    font-weight: 700;
    line-height: 1.15;
    animation: slideRightText 2s ease-in-out;
}

.hero-name {
    display: inline-block;
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Hero visual grid — transparent wrapper so children join the hero grid */
.hero-visual {
    display: contents;
}

#images-grid {
    display: grid;
    grid-template-columns: repeat(58, 1fr);
    grid-template-rows:    repeat(41, 1fr);
    align-self: end;
}

/* Wrapper / image positions (preserving original grid areas & animations) */
.wrapper-desk {
    grid-area: 13/13/42/59;
    animation: slideRightDeskOpaque 1s;
}

.desk {
    width: 100%;
    height: 100%;
    animation: rotateDesk 1s;
}

.wrapper-pc {
    grid-area: 1/20/20/40;
    z-index: 1;
    animation: slideDown 1.5s 1.5s ease-out;
}

.pc {
    width: 100%;
    height: 100%;
    animation: hide 1.5s;
}

.wrapper-chess {
    grid-area: 16/46/21/57;
    z-index: 1;
    animation: slideLeftChess 1.5s 3.5s ease-out;
}

.wrapper-chess > a {
    display: block;
    animation: rotateChess 1s 3.5s;
}

.chess {
    width: 100%;
    height: 100%;
    animation: hide 3.5s;
}

.wrapper-rubik {
    grid-area: 16/41/19/44;
    z-index: 1;
    animation: slideDown 1.5s 2.5s ease-in-out;
}

.wrapper-rubik > div {
    animation: slideLeftRubikandHide 4s ease-out;
}

.wrapper-rubik > div > div {
    animation: rotateRubik 1.5s 2.5s;
}

.rubik {
    width: 100%;
    height: 100%;
    cursor: pointer;
}

.wrapper-cards {
    grid-area: 14/20/16/24;
    z-index: 1;
    animation: appear 2s 3s;
}

.cards {
    width: 80%;
    height: 80%;
    animation: hide 3s;
}

.wrapper-bike {
    grid-area: 5/2/35/33;
    z-index: -1;
    animation: rotateBike 1.5s 4s;
}

.wrapper-bike > div {
    animation: hide 4s;
}

.bike {
    width: 100%;
    height: 100%;
    animation: slideRigthBike 1.5s 4s;
}

.wrapper-basketball {
    grid-area: 34/51/42/59;
    z-index: 1;
    animation: slideLeftBall 1.5s 4.5s;
}

.wrapper-basketball > div {
    animation: hide 4.5s;
}

.basketball {
    width: 100%;
    height: 100%;
    animation: rotateBall 1.5s 4.5s;
}

/* ─── ABOUT SECTION ─────────────────────────────────────── */
#about {
    padding-block: var(--section-gap);
    color: var(--color-text-muted);
    scroll-margin-top: var(--sp-4);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--sp-16);
    align-items: start;
}

.about-image {
    justify-items: right;
}

.about-image img {
    width: 100%;
}

.about-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--sp-8);
    margin-bottom: var(--sp-8);
}

.about-header-text {
    flex: 1;
}

.about-header-text .section-title {
    margin-bottom: var(--sp-4);
}

/* Mobile-only photo in about header */
.about-header-img {
    display: none;
    width: 35%;
    flex-shrink: 0;
}

.about-header-img img {
    border-radius: var(--radius-md);
    width: 100%;
}

/* Tabs */
.tabs {
    display: flex;
    gap: var(--sp-8);
    margin-bottom: var(--sp-10);
    border-bottom: 1px solid var(--color-border);
    flex-wrap: wrap;
}

.tab-btn {
    background: none;
    border: none;
    color: var(--color-text-muted);
    font-size: var(--text-lg);
    font-weight: 500;
    padding-bottom: var(--sp-3);
    cursor: pointer;
    position: relative;
    white-space: nowrap;
    transition: color var(--t-base);
}

.tab-btn::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: -1px;
    width: 0;
    height: 2px;
    background: var(--color-accent);
    transition: width var(--t-base);
}

.tab-btn.active {
    color: var(--color-text);
}

.tab-btn.active::after {
    width: 50%;
}

/* Tab panels */
.tab-panel {
    display: none;
}

.tab-panel.active {
    display: block;
}

/* Tab item (rendered by renderer.js) */
.tab-list {
    display: flex;
    flex-direction: column;
    gap: var(--sp-6);
}

.tab-item {
    font-size: var(--text-sm);
}

.tab-item-title {
    color: var(--color-accent);
    font-size: var(--text-lg);
    font-weight: 500;
}

.tab-item-title:hover {
    text-decoration: underline;
}

.tab-item-meta {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    margin-block: var(--sp-1) var(--sp-2);
}

.tab-item-desc {
    line-height: 1.75;
    color: var(--color-text-muted);
}

/* ─── SKILLS SECTION ─────────────────────────────────────── */
#skills {
    padding-block: var(--section-gap);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--sp-8);
}

.skill-card {
    background: var(--color-bg-card);
    border-radius: var(--radius-md);
    padding: var(--sp-8);
    font-size: var(--text-sm);
    font-weight: 300;
    transition: background var(--t-slow), transform var(--t-slow);
}

.skill-card:hover {
    background: var(--color-purple);
    transform: translateY(-10px);
}

.skill-icon {
    display: flex;
    gap: var(--sp-3);
    font-size: 3rem;
    margin-bottom: var(--sp-6);
}

.skill-icon img,
.skill-img-icon {
    height: 50px;
    width: 50px;
    object-fit: contain;
}

.skill-name {
    font-size: var(--text-xl);
    font-weight: 500;
    margin-bottom: var(--sp-4);
}

.skill-desc {
    color: var(--color-text-muted);
    line-height: 1.7;
}

.skill-links {
    display: flex;
    flex-direction: column;
    gap: var(--sp-2);
    margin-top: var(--sp-4);
}

.skill-link {
    color: var(--color-text);
    font-size: var(--text-sm);
    transition: color var(--t-fast);
}

.skill-link:hover {
    color: var(--color-accent);
}

/* ─── PORTFOLIO SECTION ──────────────────────────────────── */
#portfolio {
    padding-block: var(--section-gap);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(424px, 1fr));
    gap: var(--sp-8);
}

.project-card {
    border-radius: var(--radius-md);
    overflow: hidden;
    position: relative;
    aspect-ratio: 16 / 10;
}

.project-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--t-slow);
}

.project-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(20, 46, 104, 0.95), var(--color-accent-dim));
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--sp-8);
    text-align: center;
    opacity: 0;
    transition: opacity var(--t-slow);
}

.project-card:hover .project-img {
    transform: scale(1.06);
}

.project-card:hover .project-overlay {
    opacity: 1;
}

.project-title {
    font-size: var(--text-lg);
    font-weight: 700;
    margin-bottom: var(--sp-4);
}

.project-desc {
    font-size: var(--text-sm);
    text-align: justify;
    max-height: 9rem;
}

.project-link {
    margin-top: var(--sp-4);
    flex-shrink: 0;
    width: 52px;
    height: 52px;
    border-radius: var(--radius-full);
    background: #fff;
    color: #142e68;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    transition: background var(--t-base), color var(--t-base);
}

.project-link:hover {
    background: var(--color-accent);
    color: #fff;
}

.projects-controls {
    display: flex;
    justify-content: center;
    gap: var(--sp-4);
    margin-top: var(--sp-6);
}

/* ─── CONTACT SECTION ────────────────────────────────────── */
#contact {
    padding-block: var(--section-gap);
    scroll-margin-top: var(--sp-12);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--sp-16);
    align-items: start;
}

.contact-link {
    display: flex;
    align-items: center;
    gap: var(--sp-4);
    margin-top: var(--sp-6);
    color: var(--color-text);
    transition: color var(--t-fast);
}

.contact-link i {
    color: var(--color-accent);
    font-size: 1.4rem;
    width: 1.5rem;
}

.contact-link:hover i {
    color: var(--color-purple);
}

.contact-link span {
    font-size: var(--text-base);
}

.social-icons {
    display: flex;
    gap: var(--sp-4);
    margin-top: var(--sp-6);
    margin-bottom: var(--sp-6);
    flex-wrap: wrap;
}

.social-icons a {
    font-size: 1.8rem;
    color: var(--color-text-muted);
    display: inline-flex;
    transition: color var(--t-base), transform var(--t-base);
}

.social-icons a:hover {
    color: var(--color-purple);
    transform: translateY(-5px);
}

/* Contact form */
.contact-form-wrap form {
    display: flex;
    flex-direction: column;
    gap: var(--sp-4);
}

form input,
form textarea {
    width: 100%;
    border: 1px solid var(--color-border);
    outline: none;
    background: var(--color-bg-card);
    padding: var(--sp-4);
    color: var(--color-text);
    font-size: var(--text-lg);
    border-radius: var(--radius-sm);
    font-family: var(--font), sans-serif;
    transition: border-color var(--t-fast);
}

form input:focus,
form textarea:focus {
    border-color: var(--color-accent);
}

form textarea {
    resize: vertical;
    min-height: 120px;
}

#form-msg {
    min-height: 1.5em;
    font-size: var(--text-sm);
    display: block;
    margin-top: var(--sp-2);
}

.form-msg--success {
    color: #61b752;
}

.form-msg--error {
    color: #e05c5c;
}

/* ─── FOOTER ─────────────────────────────────────────────── */
footer {
    text-align: center;
    padding: var(--sp-6);
    background: var(--color-bg-card);
    font-size: var(--text-sm);
    font-weight: 300;
    color: var(--color-text-muted);
    margin-top: var(--sp-8);
}

footer i {
    color: var(--color-heart);
}

/* ─── SCROLL REVEAL ──────────────────────────────────────── */
.reveal {
    opacity: 0;
    transform: translateY(28px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}