:root {
    --primary-blue: #1e3a8a;    /* Deep Sea Blue */
    --slate-900: #0f172a;       /* Darkest Gray/Blue */
    --slate-700: #334155;       /* Medium Slate */
    --slate-100: #f1f5f9;       /* Light Gray Background */
    --border-gray: #e2e8f0;
    --white: #ffffff;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', sans-serif;
}

body {
    background-color: var(--white);
    color: var(--slate-700);
    line-height: 1.6;
}

/* Shared Container */
.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Hero Section */
.hero {
    background-color: var(--slate-900);
    color: var(--white);
    padding: 100px 20px;
    border-bottom: 4px solid var(--primary-blue);
}

h1 { font-size: 3rem; font-weight: 700; margin-bottom: 16px; color: var(--white); }
.hero p { font-size: 1.25rem; color: #94a3b8; max-width: 650px; margin-bottom: 32px; }

/* Buttons */
.btn-group { display: flex; gap: 15px; }
.btn {
    display: inline-block;
    background: var(--primary-blue);
    color: var(--white);
    padding: 12px 24px;
    text-decoration: none;
    border-radius: 4px;
    font-weight: 600;
    transition: background 0.2s;
}
.btn:hover { background: #2563eb; }

/* Layout & Sections */
section { padding: 80px 0; }
.section-title {
    color: var(--slate-900);
    font-size: 1.75rem;
    margin-bottom: 40px;
    display: flex;
    align-items: center;
    gap: 15px;
}
.section-title::after { content: ""; flex-grow: 1; height: 1px; background: var(--border-gray); }

.about-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 40px;
    align-items: start;
}

/* Skills List */
.skills-list { display: grid; grid-template-columns: 1fr; gap: 10px; }
.skill-item { display: flex; align-items: center; gap: 8px; font-weight: 500; color: var(--slate-900); }
.bullet { width: 6px; height: 6px; background: var(--primary-blue); border-radius: 50%; }

/* Project Cards */
.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
    margin-bottom: 40px;
}
.project-card {
    border: 1px solid var(--border-gray);
    border-radius: 8px;
    padding: 24px;
    background: var(--white);
    transition: border-color 0.2s;
}
.project-card:hover { border-color: var(--primary-blue); }
.project-tag { font-size: 0.75rem; text-transform: uppercase; color: var(--primary-blue); font-weight: 700; margin-bottom: 8px; display: block; }
.project-card h3 { color: var(--slate-900); margin-bottom: 12px; }

/* Archive Page Specifics */
.back-link { 
    color: var(--primary-blue); 
    text-decoration: none; 
    font-weight: 600; 
    display: block; 
    margin: 40px 0; 
}

.archive-title { color: var(--slate-900) !important; font-size: 2.5rem; margin-bottom: 10px; }

table { width: 100%; border-collapse: collapse; margin-top: 40px; margin-bottom: 80px; }
th { text-align: left; padding: 15px; border-bottom: 2px solid var(--slate-900); color: var(--slate-900); font-size: 0.9rem; text-transform: uppercase; }
td { padding: 20px 15px; border-bottom: 1px solid var(--border-gray); }

.year { color: #94a3b8; font-family: monospace; }
.project-link { font-weight: 600; color: var(--slate-900); text-decoration: none; }
.project-link:hover { color: var(--primary-blue); }
.tech-stack { font-size: 0.85rem; color: #64748b; }

.archive-link-container { text-align: center; margin-top: 20px; }
.archive-link {
    color: var(--primary-blue);
    text-decoration: none;
    font-weight: 600;
    border-bottom: 2px solid transparent;
    transition: 0.2s;
}
.archive-link:hover { border-bottom-color: var(--primary-blue); }

footer { background: var(--slate-100); padding: 40px 0; text-align: center; border-top: 1px solid var(--border-gray); font-size: 0.9rem; }

/* Mobile Optimization */
@media (max-width: 768px) {
    .about-grid { grid-template-columns: 1fr; }
    h1 { font-size: 2.2rem; }
    .hide-mobile { display: none; }
}

/* Error Page Specifics */
.error-container {
    height: 80vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
}

.error-code {
    font-size: 8rem;
    font-weight: 800;
    color: var(--slate-100);
    line-height: 1;
    margin-bottom: 0;
    position: absolute;
    z-index: -1;
}

.error-message {
    z-index: 1;
}

.error-message h2 {
    color: var(--slate-900);
    font-size: 2rem;
    margin-bottom: 10px;
}

.redirect-text {
    margin-top: 20px;
    font-size: 0.9rem;
    color: var(--slate-700);
}

#countdown {
    font-weight: 700;
    color: var(--primary-blue);
}