/* ============================================
   BASE.CSS - Structural Layout & Default Variables
   All themes override these custom properties
   ============================================ */

:root {
    /* Typography */
    --font-primary: system-ui, -apple-system, sans-serif;
    --font-secondary: system-ui, -apple-system, sans-serif;
    --font-mono: 'Courier New', monospace;
    --font-size-base: 1rem;
    --font-size-sm: 0.875rem;
    --font-size-h1: clamp(2.5rem, 6vw, 5rem);
    --font-size-h2: clamp(1.5rem, 3vw, 2.25rem);
    --font-size-h3: 1.25rem;
    --line-height: 1.6;

    /* Colors */
    --color-bg: #ffffff;
    --color-text: #1a1a1a;
    --color-primary: #0066ff;
    --color-secondary: #ff3366;
    --color-accent: #ffcc00;
    --color-surface: #f5f5f5;
    --color-border: #e0e0e0;
    --color-muted: #888888;

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 2rem;
    --space-xl: 4rem;
    --space-2xl: 6rem;

    /* Layout */
    --max-width: 1100px;
    --border-radius: 8px;
    --shadow: 0 2px 8px rgba(0,0,0,0.1);
    --border-width: 1px;
    --border-style: solid;
    --card-padding: var(--space-lg);
    --section-padding: var(--space-2xl) var(--space-lg);
    --transition-speed: 0.3s;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    line-height: var(--line-height);
    color: var(--color-text);
    background-color: var(--color-bg);
    transition: background-color var(--transition-speed), color var(--transition-speed);
    -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--color-primary); }

/* ============================================
   HERO
   ============================================ */
.hero {
    min-height: 80vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--space-2xl) var(--space-lg);
    position: relative;
    overflow: hidden;
}

.hero__content {
    position: relative;
    z-index: 1;
    max-width: 700px;
}

.hero__greeting {
    font-size: var(--font-size-h3);
    color: var(--color-muted);
    margin-bottom: var(--space-sm);
}

.hero__name {
    font-family: var(--font-secondary);
    font-size: var(--font-size-h1);
    line-height: 1.1;
    margin-bottom: var(--space-md);
}

.hero__tagline {
    font-size: clamp(1.1rem, 2.5vw, 1.5rem);
    color: var(--color-primary);
    margin-bottom: var(--space-md);
    font-weight: 600;
}

.hero__intro {
    font-size: 1.05rem;
    color: var(--color-muted);
    margin-bottom: var(--space-xl);
    line-height: 1.7;
}

.hero__cta {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
    flex-wrap: wrap;
}

.hero__decoration {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

/* ============================================
   NAVIGATION
   ============================================ */
.main-nav {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--color-bg);
    border-bottom: var(--border-width) var(--border-style) var(--color-border);
    transition: background-color var(--transition-speed);
}

.main-nav__list {
    display: flex;
    justify-content: center;
    gap: var(--space-lg);
    list-style: none;
    padding: var(--space-md) var(--space-lg);
    max-width: var(--max-width);
    margin: 0 auto;
    flex-wrap: wrap;
}

.main-nav__link {
    text-decoration: none;
    color: var(--color-text);
    font-family: var(--font-secondary);
    font-size: var(--font-size-sm);
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    transition: color var(--transition-speed);
    padding: var(--space-xs) 0;
}

.main-nav__link:hover {
    color: var(--color-primary);
}

/* ============================================
   SECTIONS (general)
   ============================================ */
.section {
    padding: var(--section-padding);
    max-width: var(--max-width);
    margin: 0 auto;
}

.section__title {
    font-family: var(--font-secondary);
    font-size: var(--font-size-h2);
    margin-bottom: var(--space-sm);
}

.section__subtitle {
    color: var(--color-muted);
    margin-bottom: var(--space-xl);
    font-size: 1.05rem;
}

/* ============================================
   ABOUT
   ============================================ */
.about__content {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: var(--space-xl);
    align-items: start;
}

.about__photo-placeholder {
    width: 200px;
    height: 200px;
    border-radius: var(--border-radius);
    background: var(--color-primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 4rem;
    font-family: var(--font-secondary);
    font-weight: 700;
}

.about__text p {
    margin-bottom: var(--space-md);
    line-height: 1.8;
}

/* ============================================
   SKILLS
   ============================================ */
.skills__grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--space-lg);
}

.skill-card {
    background: var(--color-surface);
    border: var(--border-width) var(--border-style) var(--color-border);
    border-radius: var(--border-radius);
    padding: var(--card-padding);
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
    position: relative;
}

.skill-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.skill-card__icon {
    font-size: 2rem;
    display: block;
    margin-bottom: var(--space-sm);
    color: var(--color-primary);
}

.skill-card__name {
    font-family: var(--font-secondary);
    font-size: var(--font-size-h3);
    margin-bottom: var(--space-sm);
}

.skill-card__desc {
    color: var(--color-muted);
    font-size: var(--font-size-sm);
    margin-bottom: var(--space-md);
    line-height: 1.6;
}

.skill-card__level {
    height: 6px;
    background: var(--color-border);
    border-radius: 3px;
    overflow: hidden;
}

.skill-card__bar {
    height: 100%;
    background: var(--color-primary);
    border-radius: 3px;
    transition: width 1s ease;
}

/* Animate skill bars based on data-level */
[data-level="95"] .skill-card__bar { width: 95%; }
[data-level="90"] .skill-card__bar { width: 90%; }
[data-level="85"] .skill-card__bar { width: 85%; }
[data-level="80"] .skill-card__bar { width: 80%; }
[data-level="75"] .skill-card__bar { width: 75%; }
[data-level="70"] .skill-card__bar { width: 70%; }

/* ============================================
   PROJECTS
   ============================================ */
.projects__grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--space-lg);
}

.project-card {
    background: var(--color-surface);
    border: var(--border-width) var(--border-style) var(--color-border);
    border-radius: var(--border-radius);
    overflow: hidden;
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
}

.project-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow);
}

.project-card__image {
    aspect-ratio: 16/9;
    overflow: hidden;
}

.project-card__placeholder {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    font-weight: 900;
    color: rgba(255,255,255,0.3);
    font-family: var(--font-secondary);
}

.project-card__content {
    padding: var(--card-padding);
}

.project-card__title {
    font-family: var(--font-secondary);
    font-size: var(--font-size-h3);
    margin-bottom: var(--space-sm);
}

.project-card__description {
    color: var(--color-muted);
    font-size: var(--font-size-sm);
    margin-bottom: var(--space-md);
    line-height: 1.6;
}

.project-card__tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
    margin-bottom: var(--space-md);
}

.tag {
    display: inline-block;
    padding: 2px 10px;
    border-radius: 100px;
    font-size: 0.75rem;
    font-weight: 600;
    background: var(--color-bg);
    color: var(--color-primary);
    border: 1px solid var(--color-border);
}

.project-card__links {
    display: flex;
    gap: var(--space-sm);
}

/* ============================================
   TIMELINE
   ============================================ */
.timeline {
    position: relative;
    padding-left: var(--space-xl);
}

.timeline::before {
    content: '';
    position: absolute;
    left: 6px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--color-border);
}

.timeline__item {
    position: relative;
    margin-bottom: var(--space-xl);
}

.timeline__item:last-child {
    margin-bottom: 0;
}

.timeline__marker {
    position: absolute;
    left: calc(-1 * var(--space-xl) + 0px);
    top: 4px;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--color-primary);
    border: 3px solid var(--color-bg);
    box-shadow: 0 0 0 2px var(--color-primary);
}

.timeline__date {
    display: inline-block;
    font-size: var(--font-size-sm);
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--space-xs);
    font-family: var(--font-mono);
}

.timeline__title {
    font-family: var(--font-secondary);
    font-size: var(--font-size-h3);
    margin-bottom: var(--space-xs);
}

.timeline__description {
    color: var(--color-muted);
    line-height: 1.7;
}

/* ============================================
   MESSAGE BOARD
   ============================================ */
.message-form {
    background: var(--color-surface);
    border: var(--border-width) var(--border-style) var(--color-border);
    border-radius: var(--border-radius);
    padding: var(--card-padding);
    margin-bottom: var(--space-xl);
}

.message-form__row {
    display: flex;
    gap: var(--space-md);
}

.message-form__field {
    margin-bottom: var(--space-md);
    flex: 1;
}

.message-form__label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 600;
    margin-bottom: var(--space-xs);
    color: var(--color-text);
}

.message-form__input,
.message-form__textarea {
    width: 100%;
    padding: var(--space-sm) var(--space-md);
    border: var(--border-width) var(--border-style) var(--color-border);
    border-radius: var(--border-radius);
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    background: var(--color-bg);
    color: var(--color-text);
    transition: border-color var(--transition-speed);
    resize: vertical;
}

.message-form__input:focus,
.message-form__textarea:focus {
    outline: none;
    border-color: var(--color-primary);
}

.messages-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.message-item {
    padding: var(--space-md) var(--space-lg);
    background: var(--color-surface);
    border: var(--border-width) var(--border-style) var(--color-border);
    border-radius: var(--border-radius);
}

.message-item__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-sm);
}

.message-item__author {
    font-family: var(--font-secondary);
    font-weight: 700;
    color: var(--color-primary);
}

.message-item__time {
    font-size: 0.75rem;
    color: var(--color-muted);
}

.message-item__body {
    line-height: 1.6;
    color: var(--color-text);
}

/* ============================================
   CONTACT
   ============================================ */
.contact__grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: var(--space-lg);
}

.contact__card {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: var(--space-xl) var(--space-lg);
    background: var(--color-surface);
    border: var(--border-width) var(--border-style) var(--color-border);
    border-radius: var(--border-radius);
    text-decoration: none;
    color: var(--color-text);
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
}

.contact__card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow);
}

.contact__icon {
    font-size: 2.5rem;
    margin-bottom: var(--space-md);
}

.contact__label {
    font-family: var(--font-secondary);
    font-weight: 700;
    font-size: var(--font-size-h3);
    margin-bottom: var(--space-xs);
}

.contact__value {
    color: var(--color-muted);
    font-size: var(--font-size-sm);
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.75rem;
    border: var(--border-width) var(--border-style) var(--color-border);
    border-radius: var(--border-radius);
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    transition: all var(--transition-speed);
    line-height: 1;
}

.btn--sm {
    padding: 0.5rem 1rem;
    font-size: var(--font-size-sm);
}

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

.btn--primary:hover {
    opacity: 0.9;
    transform: translateY(-1px);
}

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

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

/* ============================================
   FOOTER
   ============================================ */
.footer {
    border-top: var(--border-width) var(--border-style) var(--color-border);
    padding: var(--space-xl) var(--space-lg);
    text-align: center;
}

.footer__content {
    max-width: var(--max-width);
    margin: 0 auto;
}

.footer__text {
    color: var(--color-muted);
    font-size: var(--font-size-sm);
    margin-bottom: var(--space-sm);
}

.footer__style-info {
    font-size: var(--font-size-sm);
    color: var(--color-muted);
    margin-bottom: var(--space-sm);
}

.footer__admin-link {
    font-size: 0.75rem;
    color: var(--color-muted);
    text-decoration: none;
    opacity: 0.5;
}

.footer__admin-link:hover {
    opacity: 1;
}

/* ============================================
   THEME SWITCHER
   ============================================ */
.theme-switcher {
    position: fixed;
    right: var(--space-md);
    top: 50%;
    transform: translateY(-50%);
    z-index: 1000;
}

.theme-switcher__toggle {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    border: 2px solid var(--color-border);
    background: var(--color-surface);
    color: var(--color-text);
    font-size: 1.25rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow);
    transition: all var(--transition-speed);
}

.theme-switcher__toggle:hover {
    background: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

.theme-switcher__panel {
    display: none;
    position: absolute;
    right: calc(100% + var(--space-md));
    top: 50%;
    transform: translateY(-50%);
    width: 320px;
    padding: var(--space-lg);
    background: var(--color-surface);
    border: var(--border-width) var(--border-style) var(--color-border);
    border-radius: var(--border-radius);
    box-shadow: 0 8px 32px rgba(0,0,0,0.15);
}

.theme-switcher__panel.is-open {
    display: block;
}

.theme-switcher__title {
    font-family: var(--font-secondary);
    font-size: 1rem;
    margin-bottom: var(--space-md);
    text-align: center;
}

.theme-switcher__grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-sm);
}

.theme-switcher__btn {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius);
    background: var(--color-bg);
    color: var(--color-text);
    cursor: pointer;
    font-size: 0.8rem;
    font-family: var(--font-primary);
    font-weight: 600;
    transition: all var(--transition-speed);
    text-align: left;
}

.theme-switcher__btn:hover {
    border-color: var(--color-primary);
    background: var(--color-primary);
    color: white;
}

.theme-switcher__btn.is-active {
    border-color: var(--color-primary);
    background: var(--color-primary);
    color: white;
}

.theme-switcher__btn-swatch {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    flex-shrink: 0;
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 768px) {
    .about__content {
        grid-template-columns: 1fr;
        justify-items: center;
        text-align: center;
    }

    .skills__grid,
    .projects__grid {
        grid-template-columns: 1fr;
    }

    .main-nav__list {
        gap: var(--space-md);
        justify-content: center;
    }

    .theme-switcher {
        right: var(--space-sm);
        top: auto;
        bottom: var(--space-lg);
        transform: none;
    }

    .theme-switcher__panel {
        right: 0;
        top: auto;
        bottom: calc(100% + var(--space-md));
        transform: none;
        width: 280px;
    }

    .message-form__row {
        flex-direction: column;
        gap: 0;
    }

    .contact__grid {
        grid-template-columns: 1fr;
    }
}