/* ═════════════════════════════════════════════════════════════════════
   YOUSEF ABDELSALAM — SOFTWARE ENGINEERING PORTFOLIO
   University of Guelph · Software Engineering '28
   ═════════════════════════════════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600&display=swap');

:root {
    --bg-dark: #07090e;
    --bg-surface: #0e131f;
    --bg-surface-elevated: #141b2d;
    --bg-card: rgba(14, 19, 31, 0.7);
    --bg-card-hover: rgba(20, 27, 45, 0.85);
    
    --border-subtle: rgba(255, 255, 255, 0.07);
    --border-focus: rgba(96, 165, 250, 0.4);
    
    --accent-blue: #3b82f6;
    --accent-indigo: #6366f1;
    --accent-cyan: #06b6d4;
    --accent-emerald: #10b981;
    
    --guelph-red: #c8102e;
    --guelph-gold: #ffc72c;
    
    --text-main: #f1f5f9;
    --text-muted: #94a3b8;
    --text-dim: #64748b;
    
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 18px;
    --radius-full: 9999px;
}

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

html {
    scroll-behavior: smooth;
    color-scheme: dark;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-dark);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ── Clean Ambient Lighting & Grid ── */
.ambient-bg {
    position: fixed;
    inset: 0;
    background: 
        radial-gradient(circle at 15% 15%, rgba(59, 130, 246, 0.06) 0%, transparent 45%),
        radial-gradient(circle at 85% 85%, rgba(99, 102, 241, 0.05) 0%, transparent 45%);
    pointer-events: none;
    z-index: 0;
}

.grid-pattern {
    position: fixed;
    inset: 0;
    background-image: linear-gradient(to right, rgba(255, 255, 255, 0.03) 1px, transparent 1px),
                      linear-gradient(to bottom, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
    background-size: 40px 40px;
    pointer-events: none;
    z-index: 0;
    mask-image: radial-gradient(ellipse 60% 50% at 50% 50%, #000 70%, transparent 100%);
    -webkit-mask-image: radial-gradient(ellipse 60% 50% at 50% 50%, #000 70%, transparent 100%);
}

/* ── Typography ── */
.font-mono {
    font-family: var(--font-mono);
}

.text-gradient {
    background: linear-gradient(135deg, #ffffff 30%, #94a3b8 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.text-gradient-blue {
    background: linear-gradient(135deg, #60a5fa 0%, #a78bfa 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-tag {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--accent-blue);
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

/* ── University of Guelph Badge ── */
.guelph-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 14px;
    border-radius: var(--radius-full);
    background: rgba(255, 199, 44, 0.08);
    border: 1px solid rgba(255, 199, 44, 0.25);
    font-size: 0.8125rem;
    font-weight: 500;
    color: #fef08a;
    text-decoration: none;
    transition: all 0.2s ease;
}

.guelph-badge:hover {
    background: rgba(255, 199, 44, 0.15);
    border-color: rgba(255, 199, 44, 0.4);
    transform: translateY(-1px);
}

.guelph-indicator {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background-color: #ef4444;
    box-shadow: 0 0 6px rgba(239, 68, 68, 0.8);
}

/* ── Navigation ── */
.navbar-container {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 50;
    padding: 16px;
}

.navbar {
    max-width: 1000px;
    margin: 0 auto;
    background: rgba(10, 13, 20, 0.82);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: 10px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-brand {
    font-family: var(--font-mono);
    font-size: 1.1rem;
    font-weight: 700;
    color: #ffffff;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 4px;
    list-style: none;
}

.nav-item a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    padding: 6px 14px;
    border-radius: var(--radius-sm);
    transition: all 0.2s ease;
}

.nav-item a:hover {
    color: #ffffff;
    background: rgba(255, 255, 255, 0.05);
}

.nav-item a.active {
    color: #60a5fa;
    background: rgba(96, 165, 250, 0.1);
    font-weight: 600;
}

/* ── Cards & Containers ── */
.card {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    position: relative;
}

.card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-focus);
    transform: translateY(-3px);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.35);
}

/* ── Buttons ── */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 9px 18px;
    font-family: var(--font-sans);
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: var(--radius-sm);
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s ease;
    border: 1px solid transparent;
}

.btn-primary {
    background: #2563eb;
    color: #ffffff;
}

.btn-primary:hover {
    background: #1d4ed8;
    transform: translateY(-1px);
    box-shadow: 0 4px 15px rgba(37, 99, 235, 0.35);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.1);
    color: var(--text-main);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-1px);
}

.btn-outline-blue {
    background: rgba(59, 130, 246, 0.1);
    border-color: rgba(59, 130, 246, 0.3);
    color: #93c5fd;
}

.btn-outline-blue:hover {
    background: rgba(59, 130, 246, 0.2);
    border-color: rgba(59, 130, 246, 0.5);
    transform: translateY(-1px);
}

.btn-emerald {
    background: rgba(16, 185, 129, 0.12);
    border-color: rgba(16, 185, 129, 0.28);
    color: #6ee7b7;
}

.btn-emerald:hover {
    background: rgba(16, 185, 129, 0.22);
    border-color: rgba(16, 185, 129, 0.45);
    transform: translateY(-1px);
}

.btn-sm {
    padding: 6px 12px;
    font-size: 0.8125rem;
}

/* ── Badges & Tags ── */
.tag {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    padding: 3px 9px;
    border-radius: var(--radius-sm);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.09);
    color: #cbd5e1;
    white-space: nowrap;
}

.tag-blue {
    background: rgba(59, 130, 246, 0.1);
    border-color: rgba(59, 130, 246, 0.25);
    color: #93c5fd;
}

.tag-purple {
    background: rgba(168, 85, 247, 0.1);
    border-color: rgba(168, 85, 247, 0.25);
    color: #d8b4fe;
}

.tag-emerald {
    background: rgba(16, 185, 129, 0.1);
    border-color: rgba(16, 185, 129, 0.25);
    color: #6ee7b7;
}

.tag-amber {
    background: rgba(245, 158, 11, 0.1);
    border-color: rgba(245, 158, 11, 0.25);
    color: #fcd34d;
}

/* ── Dividers ── */
.divider {
    height: 1px;
    width: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
}

/* ── Scroll Reveal ── */
.reveal {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.5s ease-out, transform 0.5s ease-out;
}

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

/* ── Custom Scrollbar ── */
::-webkit-scrollbar {
    width: 6px;
}
::-webkit-scrollbar-track {
    background: #07090e;
}
::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.15);
    border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* ── Filter Buttons ── */
.filter-btn {
    padding: 6px 14px;
    border-radius: var(--radius-sm);
    font-size: 0.8125rem;
    font-weight: 500;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.08);
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.2s ease;
}

.filter-btn:hover {
    background: rgba(255, 255, 255, 0.08);
    color: #ffffff;
}

.filter-btn.active {
    background: rgba(59, 130, 246, 0.15);
    border-color: rgba(59, 130, 246, 0.4);
    color: #93c5fd;
    font-weight: 600;
}

/* ── Toast Alert Notifications ── */
#toast-container {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 1100;
    display: flex;
    flex-direction: column;
    gap: 8px;
    pointer-events: none;
}

.toast {
    pointer-events: auto;
    display: flex;
    align-items: center;
    gap: 12px;
    background: #0f172a;
    border: 1px solid rgba(59, 130, 246, 0.35);
    color: #ffffff;
    padding: 12px 18px;
    border-radius: var(--radius-sm);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
    font-size: 0.875rem;
    animation: toastIn 0.25s ease-out;
}

@keyframes toastIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ── Lightbox for Photos ── */
#lightbox {
    position: fixed;
    inset: 0;
    z-index: 1200;
    background: rgba(3, 5, 10, 0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    display: none;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

#lightbox.open {
    display: flex;
}

.lightbox-wrap {
    position: relative;
    max-width: 90vw;
    max-height: 85vh;
    display: flex;
    flex-direction: column;
    align-items: center;
}

#lightbox-img {
    max-width: 100%;
    max-height: 75vh;
    object-fit: contain;
    border-radius: var(--radius-sm);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.lightbox-close {
    position: absolute;
    top: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.15);
    color: #ffffff;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 1.1rem;
    transition: background 0.2s;
}

.lightbox-close:hover {
    background: rgba(255, 255, 255, 0.2);
}

.lightbox-arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.15);
    color: #ffffff;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 1.1rem;
    transition: all 0.2s ease;
    z-index: 10;
}

.lightbox-arrow:hover {
    background: rgba(59, 130, 246, 0.3);
    border-color: rgba(59, 130, 246, 0.5);
}

.lightbox-prev { left: 20px; }
.lightbox-next { right: 20px; }

#lightbox-caption {
    margin-top: 12px;
    font-size: 0.875rem;
    color: var(--text-muted);
    text-align: center;
}