/* ===== CSS Variables ===== */
:root {
    --bg-primary: #0a0a0a;
    --bg-secondary: #111111;
    --text-primary: #e0e0e0;
    --text-secondary: #a0a0a0;
    --accent: #64b5f6;
    --accent-hover: #90caf9;
    --border-color: #2a2a2a;
    --font-mono: 'SF Mono', 'Fira Code', 'Consolas', monospace;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    --max-width: 680px;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ===== Typography ===== */
h1, h2, h3, h4 {
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: var(--spacing-sm);
}

h1 {
    font-size: 2.25rem;
}

h2 {
    font-size: 1.5rem;
    color: var(--text-primary);
}

h3 {
    font-size: 1.25rem;
}

p {
    margin-bottom: var(--spacing-sm);
    color: var(--text-secondary);
}

a {
    color: var(--accent);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--accent-hover);
}

/* ===== Layout ===== */
header {
    padding: var(--spacing-lg) var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
}

nav {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

nav a {
    color: var(--text-secondary);
    font-size: 0.95rem;
    padding: var(--spacing-xs) 0;
    position: relative;
}

nav a:hover,
nav a.active {
    color: var(--accent);
}

nav a.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    background-color: var(--accent);
}

nav a.nav-blog {
    background-color: var(--accent);
    color: var(--bg-primary);
    padding: 0.35rem 0.85rem;
    border-radius: 20px;
    font-weight: 500;
    transition: all 0.2s ease;
}

nav a.nav-blog:hover {
    background-color: var(--accent-hover);
    color: var(--bg-primary);
}

main {
    flex: 1;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-md);
    width: 100%;
}

footer {
    padding: var(--spacing-lg) var(--spacing-md);
    border-top: 1px solid var(--border-color);
    text-align: center;
}

footer p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin: 0;
}

/* ===== Home Page ===== */
.hero {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.hero h1 {
    margin-bottom: var(--spacing-xs);
}

.tagline {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin: 0;
}

.intro {
    margin-bottom: var(--spacing-xl);
}

.intro p {
    font-size: 1.05rem;
    text-align: center;
}

.contact {
    text-align: center;
}

.contact h2 {
    margin-bottom: var(--spacing-md);
}

.contact-icons {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

.contact-icons a {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--text-secondary);
    padding: var(--spacing-sm);
    border-radius: 8px;
    transition: all 0.2s ease;
}

.contact-icons a:hover {
    color: var(--accent);
    background-color: var(--bg-secondary);
}

.contact-icons span {
    font-size: 0.85rem;
}

/* ===== About Page ===== */
.about-header {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.about-photo {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    object-fit: cover;
    flex-shrink: 0;
}

.about-intro h1 {
    margin-bottom: var(--spacing-xs);
}

.about-intro p {
    margin: 0;
}

.about-section {
    margin-bottom: var(--spacing-xl);
}

.about-section h2 {
    border-bottom: 1px solid var(--border-color);
    padding-bottom: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
}

.about-section ul {
    list-style: none;
    padding-left: 0;
}

.about-section li {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
    padding-left: 1.5rem;
    position: relative;
}

.about-section li::before {
    content: '—';
    position: absolute;
    left: 0;
    color: var(--accent);
}

/* ===== Contact Form ===== */
.contact-form {
    margin-top: var(--spacing-xl);
}

.contact-form h2 {
    margin-bottom: var(--spacing-md);
}

.contact-form form {
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: var(--spacing-lg);
    background-color: var(--bg-secondary);
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: var(--spacing-sm);
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 1rem;
    transition: border-color 0.2s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent);
}

.form-group textarea {
    min-height: 150px;
    resize: vertical;
}

.form-buttons {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.btn-submit,
.btn-reset {
    border: none;
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: 1rem;
    font-weight: 500;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s ease;
}

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

.btn-submit:hover:not(:disabled) {
    background-color: var(--accent-hover);
}

.btn-submit:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-reset {
    background-color: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.btn-reset:hover {
    color: var(--text-primary);
    border-color: var(--text-secondary);
}

/* ===== Toast Notifications ===== */
.toast-container {
    position: fixed;
    top: var(--spacing-md);
    right: var(--spacing-md);
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    pointer-events: none;
}

.toast {
    pointer-events: auto;
    min-width: 280px;
    max-width: 380px;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: 6px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
    position: relative;
    overflow: hidden;
    animation: slideIn 0.3s ease forwards;
}

.toast.fade-out {
    animation: fadeOut 0.3s ease forwards;
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes fadeOut {
    from {
        transform: translateX(0);
        opacity: 1;
    }
    to {
        transform: translateX(100%);
        opacity: 0;
    }
}

.toast-content {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
}

.toast-icon {
    flex-shrink: 0;
    width: 20px;
    height: 20px;
    margin-top: 2px;
}

.toast-text {
    flex: 1;
    font-size: 0.9rem;
    line-height: 1.4;
    color: #fff;
}

.toast-close {
    flex-shrink: 0;
    background: none;
    border: none;
    color: rgba(255, 255, 255, 0.7);
    cursor: pointer;
    padding: 0;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color 0.2s ease;
}

.toast-close:hover {
    color: #fff;
}

.toast-progress {
    position: absolute;
    bottom: 0;
    left: 0;
    height: 3px;
    background-color: rgba(255, 255, 255, 0.4);
    width: 100%;
    transform-origin: left;
}

.toast.success {
    background-color: #2e7d32;
}

.toast.success .toast-progress {
    background-color: rgba(255, 255, 255, 0.5);
}

.toast.error {
    background-color: #c62828;
}

.toast.error .toast-progress {
    background-color: rgba(255, 255, 255, 0.5);
}

@media (max-width: 600px) {
    .toast-container {
        left: var(--spacing-sm);
        right: var(--spacing-sm);
    }

    .toast {
        min-width: auto;
        max-width: none;
    }
}

/* ===== Projects Page ===== */
.projects-intro {
    margin-bottom: var(--spacing-xl);
}

.projects-list {
    list-style: none;
}

.projects-list li {
    margin-bottom: var(--spacing-md);
    padding-left: 1.5rem;
    position: relative;
}

.projects-list li::before {
    content: '—';
    position: absolute;
    left: 0;
    color: var(--accent);
}

.project-title {
    font-weight: 500;
}

.project-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.project-links {
    font-size: 0.85rem;
    margin-top: 0.25rem;
}

.project-links a {
    margin-right: var(--spacing-sm);
}

/* ===== Blog Page ===== */
.coming-soon {
    text-align: center;
    padding: var(--spacing-xl) 0;
}

.coming-soon h1 {
    margin-bottom: var(--spacing-md);
}

.coming-soon p {
    font-size: 1.1rem;
}

/* ===== 404 Page ===== */
.error-page {
    text-align: center;
    padding: var(--spacing-xl) 0;
}

.error-page h1 {
    font-family: var(--font-mono);
    font-size: 2.5rem;
    color: #00ff41;
    text-shadow: 0 0 10px #00ff41, 0 0 20px #00ff41;
    margin-bottom: var(--spacing-md);
}

.error-page p {
    font-family: var(--font-mono);
    color: #00ff41;
    font-size: 1.2rem;
}

.error-page a {
    display: inline-block;
    margin-top: var(--spacing-lg);
    color: #00ff41;
    border: 1px solid #00ff41;
    padding: var(--spacing-sm) var(--spacing-md);
    font-family: var(--font-mono);
    transition: all 0.2s ease;
}

.error-page a:hover {
    background-color: #00ff41;
    color: var(--bg-primary);
}

/* ===== Responsive ===== */
@media (max-width: 600px) {
    h1 {
        font-size: 1.75rem;
    }

    h2 {
        font-size: 1.25rem;
    }

    nav {
        gap: var(--spacing-md);
    }

    .about-header {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .contact-icons {
        gap: var(--spacing-md);
    }
}