/* ============================================
   PORTFOLIO - MODERNIZED PROFESSIONAL DESIGN
   Updated Color Scheme: Cyan/Turquoise + Green
   ============================================ */

/* ============================================
   CSS RESET & BASE
   ============================================ */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
}

body {
    min-height: 100vh;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

img, picture, video, canvas, svg {
    display: block;
    max-width: 100%;
    height: auto;
}

input, button, textarea, select {
    font: inherit;
    color: inherit;
}

button {
    cursor: pointer;
    border: none;
    background: none;
}

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

ul, ol {
    list-style: none;
}

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

/* ============================================
   DESIGN TOKENS - NEW COLOR SCHEME
   ============================================ */
:root {
    /* === Cyan/Turquoise Gradient Palette === */
    --color-cyan-50: #e0f7fa;
    --color-cyan-100: #b2ebf2;
    --color-cyan-200: #80deea;
    --color-cyan-300: #71f8c4;
    --color-cyan-400: #d2e5e5;
    --color-cyan-500: #1ac6c6;
    /*--color-cyan-600: #00acc1;*/
    /*--color-cyan-700: #0097a7;*/
    /*--color-cyan-800: #00838f;*/

    /* === Green Accent === */
    --color-green-primary: #4ade80;
    --color-green-hover: #22c55e;
    --color-green-dark: #16a34a;

    /* === Grayscale Base === */
    --color-bg-primary: #0f0f0f;
    --color-bg-secondary: #1a1a1a;
    --color-bg-tertiary: #2a2a2a;
    --color-surface-elevated: #242424;

    --color-surface: #1e1e1e;
    --color-text-muted: #9ca3af;

    --color-text-primary: #ffffff;
    --color-text-secondary: #d1d5db;

    --color-border: #333333;
    --color-border-light: #404040;

    /* === Accents === */
    --color-accent: --color-cyan-400;
    --color-accent-primary: --color-cyan-500;
    --color-accent-secondary: --color-green-primary;

    /* === Gradients === */
    --gradient-cyan: linear-gradient(135deg, #1ac6c6 0%, #14a6a6 100%);
    --gradient-green: linear-gradient(135deg, #4ade80 0%, #22c55e 100%);
    --gradient-bg: linear-gradient(135deg, #0f0f0f 0%, #1a1a1a 50%, #2a2a2a 100%);

    /* === Typography === */
    --font-family-primary: 'Gill Sans', 'Gill Sans MT', 'Trebuchet MS', sans-serif;
    --font-family-display: 'Gill Sans', 'Gill Sans MT', 'Trebuchet MS', sans-serif;

    --font-size-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
    --font-size-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
    --font-size-base: clamp(1rem, 0.9rem + 0.5vw, 1.125rem);
    --font-size-lg: clamp(1.125rem, 1rem + 0.6vw, 1.25rem);
    --font-size-xl: clamp(1.25rem, 1.1rem + 0.75vw, 1.5rem);
    --font-size-2xl: clamp(1.5rem, 1.25rem + 1.25vw, 2rem);
    --font-size-3xl: clamp(1.875rem, 1.5rem + 1.875vw, 2.5rem);
    --font-size-4xl: clamp(2.25rem, 1.75rem + 2.5vw, 3.5rem);

    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --font-weight-extrabold: 800;

    --line-height-tight: 1.2;
    --line-height-normal: 1.6;
    --line-height-relaxed: 1.8;

    /* === Spacing === */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;

    /* === Layout === */
    --container-max: 1080px;
    --container-padding: clamp(1rem, 4vw, 2rem);

    /* === Borders & Radius === */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;

    --border-width: 2px;

    /* === Shadows === */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);

    /* === Transitions === */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;
    --transition-bounce: 300ms cubic-bezier(0.68, -0.55, 0.265, 1.55);

    /* === Z-Index === */
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-fixed: 300;
    --z-modal: 400;
    --z-tooltip: 500;
}

/* === LIGHT THEME === */
.theme-light {
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #ebebeb;
    --color-bg-tertiary: #e0e0e0;
    --color-surface: #ffffff;
    --color-surface-elevated: #fafafa;

    --color-text-primary: #0f0f0f;
    --color-text-secondary: #525252;
    --color-text-muted: #0c0303;

    --color-border: #ffffff;
    --color-border-light: #e5e7eb;

    --gradient-bg: linear-gradient(135deg, #f5f5f5 0%, #ebebeb 50%, #e0e0e0 100%);
}

/* Light theme specific adjustments */
.theme-light .topbar {
    background: rgba(255, 255, 255, 0.85);
    border-bottom-color: rgba(0, 0, 0, 0.06);
}

.theme-light .section-divider,
.theme-light .hero::after,
.theme-light .about-intro::after,
.theme-light .skills::after,
.theme-light .projects::after {
    opacity: 0.3;
}


/* ============================================
   BASE STYLES
   ============================================ */
html, body {
    font-family: var(--font-family-primary);
    font-size: var(--font-size-base);
    color: var(--color-text-primary);
    background: var(--gradient-bg);
    background-attachment: fixed;
}

:focus-visible {
    outline: 2px solid var(--color-cyan-400);
    outline-offset: 2px;
}

/* Skip link */
.skip-link {
    position: absolute;
    top: -100%;
    left: var(--space-4);
    z-index: var(--z-tooltip);
    padding: var(--space-3) var(--space-4);
    background: var(--color-green-primary);
    color: var(--color-bg-primary);
    border-radius: var(--radius-md);
    font-weight: var(--font-weight-semibold);
    transition: top var(--transition-fast);
}

.skip-link:focus {
    top: var(--space-4);
}

/* ============================================
   SCROLL PROGRESS BAR
   ============================================ */
#scrollProgress {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    width: 0;
    background: var(--gradient-cyan);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    z-index: var(--z-fixed);
    pointer-events: none;
    will-change: width;
    transition: width 80ms linear;
}

/* ============================================
   SKILLS SECTION
   ============================================ */
.skills {
    padding: var(--space-16) var(--container-padding);
}

.skills h2 {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-bold);
    background: var(--gradient-cyan);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-align: center;
    margin: 0 0 var(--space-12);
}

.skills__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-8);
    max-width: 900px;
    margin-inline: auto;
}

@media (min-width: 768px) {
    .skills__grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* === SKILL CARD === */
.skill-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: var(--space-8);
    background: var(--color-surface);
    border: var(--border-width) solid var(--color-border);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.skill-card:hover {
    transform: translateY(-4px);
    border-color: var(--color-cyan-400);
    box-shadow: 0 8px 24px rgba(0, 188, 212, 0.2);
}

.skill-card__icon {
    font-size: 2.5rem;
    margin-bottom: var(--space-4);
}

.skill-card h3 {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-cyan-400);
    margin: 0 0 var(--space-6);
}

/* === TECH ICONS === */
.skill-card .tech-icons {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-6);
    width: 100%;
}

.skill-card .tech-icons li {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-2);
}

.skill-logo {
    width: 56px;
    height: 56px;
    object-fit: contain;
    transition: transform var(--transition-base);
    filter: saturate(0.8) brightness(1.1);
}

.skill-card .tech-icons li:hover .skill-logo {
    transform: scale(1.15) translateY(-2px);
    filter: saturate(1) brightness(1.2);
}

.skill-name {
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-secondary);
}

/* === SOFT SKILLS LIST === */
.skill-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    width: 100%;
}

.skill-list li {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    background: var(--color-bg-secondary);
    border-left: 3px solid transparent;
    border-radius: var(--radius-md);
    text-align: left;
    transition: all var(--transition-fast);
}

.skill-list li:hover {
    background: var(--color-bg-tertiary);
    border-left-color: var(--color-cyan-400);
    transform: translateX(4px);
}

.skill-bullet {
    color: var(--color-cyan-400);
    font-weight: var(--font-weight-bold);
    font-size: var(--font-size-lg);
    flex-shrink: 0;
}

.skill-list li span:last-child {
    font-size: var(--font-size-base);
    color: var(--color-text-primary);
}

/* ============================================
   PROJECTS SECTION
   ============================================ */
.projects {
    padding: var(--space-16) var(--container-padding);
    max-width: var(--container-max);
    margin-inline: auto;
}

.projects h2 {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-bold);
    background: var(--gradient-cyan);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-align: center;
    margin: 0 0 var(--space-4);
}

.projects-intro {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    text-align: center;
    max-width: 600px;
    margin: 0 auto var(--space-10);
    line-height: var(--line-height-relaxed);
}

/* === LOADING STATE === */
.projects-loading {
    text-align: center;
    padding: var(--space-12);
    color: var(--color-text-secondary);
}

.loading-spinner {
    display: inline-block;
    width: 40px;
    height: 40px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-cyan-400);
    border-radius: var(--radius-full);
    animation: spinner-rotate 0.8s linear infinite;
    margin-bottom: var(--space-4);
}

@keyframes spinner-rotate {
    to { transform: rotate(360deg); }
}

/* === ERROR STATE === */
.projects-error {
    text-align: center;
    padding: var(--space-8);
    background: var(--color-surface);
    border: var(--border-width) solid #ef4444;
    border-radius: var(--radius-xl);
    max-width: 500px;
    margin: var(--space-8) auto;
    box-shadow: var(--shadow-md);
}

.error-message {
    font-size: var(--font-size-base);
    color: var(--color-text-primary);
    margin: 0 0 var(--space-4);
    line-height: var(--line-height-normal);
}

.retry-button {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    background: var(--color-green-primary);
    color: var(--color-bg-primary);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    transition: all var(--transition-fast);
}

.retry-button:hover {
    background: var(--color-green-hover);
    transform: translateY(-2px);
}

/* === PROJECTS GRID === */
#projects-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-6);
}

@media (min-width: 640px) {
    #projects-container {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    #projects-container {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* === PROJECT CARD === */
.project-card {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    padding: var(--space-6);
    background: var(--color-surface);
    border: var(--border-width) solid var(--color-border);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    height: 100%;
    transition: all var(--transition-base);
}

.project-card:hover {
    transform: translateY(-4px);
    border-color: var(--color-cyan-400);
    box-shadow: 0 12px 30px rgba(0, 188, 212, 0.15);
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--space-3);
}

.project-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    margin: 0;
    flex: 1;
    line-height: var(--line-height-tight);
}

.project-title a {
    color: var(--color-text-primary);
    transition: color var(--transition-fast);
}

.project-title a:hover {
    color: var(--color-cyan-400);
}

/* === LANGUAGE BADGE === */
.project-language {
    flex-shrink: 0;
    padding: var(--space-1) var(--space-3);
    background: var(--color-cyan-500);
    color: white;
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.project-language.no-language {
    background: var(--color-text-muted);
    color: var(--color-bg-primary);
}

/* === PROJECT CONTENT === */
.project-description {
    font-size: var(--font-size-sm);
    line-height: var(--line-height-relaxed);
    color: var(--color-text-secondary);
    flex: 1;
    margin: 0;
}

.project-meta {
    display: flex;
    justify-content: center;
    align-items: center;
    padding-top: var(--space-3);
    border-top: 1px solid var(--color-border);
}

.project-date {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
}

/* === TOPICS === */
.project-topics {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}

.topic-tag {
    padding: var(--space-1) var(--space-3);
    background: rgba(0, 188, 212, 0.1);
    color: var(--color-cyan-400);
    border: 1px solid rgba(0, 188, 212, 0.3);
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    transition: all var(--transition-fast);
}

.topic-tag:hover {
    background: rgba(0, 188, 212, 0.2);
    border-color: var(--color-cyan-400);
}

/* ============================================
   CONTACT SECTION
   ============================================ */
.contact {
    max-width: 640px;
    margin: 0 auto var(--space-8);
    padding: var(--space-10);
    background: var(--color-surface);
    border: var(--border-width) solid var(--color-border);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
}

.contact h2 {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-bold);
    background: var(--gradient-cyan);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-align: center;
    margin: 0 0 var(--space-3);
}

.contact > p {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    text-align: center;
    margin: 0 0 var(--space-6);
}

.contact .hero__icons {
    justify-content: center;
    margin-bottom: var(--space-8);
}

.contact a[aria-label="Send email"]::before,
.contact a[aria-label="Email"]::before {
    background-image: url('../assets/images/contactIcons/1.png');
}

.contact a[aria-label="GitHub profile (opens in new tab)"]::before,
.contact a[aria-label="GitHub"]::before {
    background-image: url('../assets/images/contactIcons/2.png');
}

.contact a[aria-label="LinkedIn profile (opens in new tab)"]::before,
.contact a[aria-label="LinkedIn"]::before {
    background-image: url('../assets/images/contactIcons/3.png');
}

/* === CONTACT FORM === */
.contact-form {
    display: flex;
    flex-direction: column;
    gap: var(--space-5);
}

.form-row {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.contact-form label {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-secondary);
}

.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    background: var(--color-bg-primary);
    border: var(--border-width) solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    font-size: var(--font-size-base);
    resize: vertical;
    -webkit-appearance: none;
    appearance: none;
    transition: all var(--transition-fast);
}

.contact-form input::placeholder,
.contact-form textarea::placeholder {
    color: var(--color-text-muted);
}

.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--color-cyan-400);
    box-shadow: 0 0 0 3px rgba(0, 188, 212, 0.1);
}

.contact-form textarea {
    min-height: 120px;
}

.contact-form .input-error {
    border-color: #ef4444 !important;
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

.field-msg {
    display: block;
    margin-top: var(--space-1);
    font-size: var(--font-size-xs);
    line-height: var(--line-height-tight);
    min-height: 1.2em;
}

.field-msg.err {
    color: #ef4444;
}

.field-msg.ok {
    color: var(--color-green-primary);
}

.contact-form button[type="submit"] {
    padding: var(--space-4) var(--space-6);
    background: var(--color-green-primary);
    color: var(--color-bg-primary);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-bold);
    transition: all var(--transition-fast);
}

.contact-form button[type="submit"]:hover {
    background: var(--color-green-hover);
    transform: translateY(-2px);
}

.contact-form button[type="submit"]:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.form-status {
    min-height: 1.5rem;
    text-align: center;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-green-primary);
}

.form-status.loading::after {
    content: '';
    display: inline-block;
    width: 1em;
    height: 1em;
    margin-left: var(--space-2);
    border: 2px solid currentColor;
    border-top-color: transparent;
    border-radius: var(--radius-full);
    animation: spinner-rotate 0.6s linear infinite;
    vertical-align: middle;
}

.status-ok {
    color: var(--color-green-primary);
    animation: status-pop 0.25s ease;
}

.status-err {
    color: #ef4444;
    animation: status-pop 0.25s ease;
}

@keyframes status-pop {
    from {
        transform: scale(0.95);
        opacity: 0;
    }
    to {
        transform: scale(1);
        opacity: 1;
    }
}


/* ============================================
   FOOTER
   ============================================ */
.site-footer {
    text-align: center;
    color: var(--color-text-secondary);
    padding: var(--space-8) var(--container-padding);
    border-top: 1px solid var(--color-border);
    font-size: var(--font-size-sm);
}

.site-footer a {
    color: var(--color-cyan-400);
    transition: color var(--transition-fast);
}

.site-footer a:hover {
    color: var(--color-green-primary);
}

/* ============================================
   UTILITIES & HELPERS
   ============================================ */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin-inline: auto;
    padding-inline: var(--container-padding);
}

.hidden {
    display: none !important;
}

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

section[id] {
    scroll-margin-top: 80px;
}

/* ============================================
   RESPONSIVE ADJUSTMENTS
   ============================================ */
@media (max-width: 767px) {
    .hero {
        min-height: auto;
        padding: var(--space-8) var(--container-padding) var(--space-12);
    }

    .hero__photo {
        width: clamp(160px, 50vw, 220px);
    }

    .about-intro,
    .skills,
    .projects,
    .volunteering {
        padding: var(--space-12) var(--container-padding);
    }

    .about-intro__content {
        padding: var(--space-6);
    }

    .skill-card {
        padding: var(--space-6);
    }

    .contact {
        margin: 0 var(--container-padding) var(--space-8);
        padding: var(--space-6);
    }

    .contact h2 {
        font-size: var(--font-size-2xl);
    }

    .timeline-item {
        width: 260px;
        padding: var(--space-5);
    }

    .filter-chip {
        padding: var(--space-2) var(--space-4);
        font-size: var(--font-size-xs);
    }
}

@media (min-width: 768px) {
    .hero.hero--split {
        grid-template-columns: 1fr 1.2fr;
        text-align: left;
        gap: clamp(var(--space-8), 5vw, var(--space-12));
        align-items: center;
    }

    .hero__photo {
        justify-self: end;
        margin-inline: 0;
    }

    .hero__content {
        align-items: flex-start;
        justify-self: start;
    }

    .hero__icons {
        justify-content: flex-start;
    }
}

@media (max-width: 480px) {
    .nav {
        padding: var(--space-2) var(--space-3);
        gap: var(--space-2);
    }

    .nav__links {
        gap: var(--space-1);
    }

    .nav__links a {
        font-size: var(--font-size-xs);
        padding: var(--space-1) var(--space-2);
    }

    .theme-toggle {
        width: 32px;
        height: 32px;
        font-size: 0.875rem;
    }

}