/**
 * GPC Framework - App Base Styles
 * "Midnight Precision" Design System
 * Reset, typography, layout, utilities
 */

/* ========== CSS RESET ========== */

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

html {
    font-size: 18px;
    -webkit-text-size-adjust: 100%;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg);
    background-image: var(--surface-gradient);
    background-attachment: fixed;
    background-size: cover;
    color: var(--text);
    line-height: 1.7;
    min-height: 100vh;
    overflow-x: hidden;
    letter-spacing: -0.01em;
    position: relative;
    z-index: 0;
}

body::before,
body::after {
    content: '';
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: -1;
}

body::before {
    background-image: var(--texture);
    opacity: 1;
    mix-blend-mode: var(--page-mesh-blend, screen);
    background-size: 140% 140%;
    animation: meshDrift 36s ease-in-out infinite;
}

body::after {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160' viewBox='0 0 160 160'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.75' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23noiseFilter)' opacity='0.15'/%3E%3C/svg%3E");
    opacity: var(--grain-opacity, 0.05);
    mix-blend-mode: soft-light;
}

@keyframes meshDrift {
    0% {
        background-position: 0% 0%;
    }
    50% {
        background-position: 20% 12%;
    }
    100% {
        background-position: 0% 0%;
    }
}

@media (prefers-reduced-motion: reduce) {
    body::before {
        animation: none;
    }
}

/* ========== TYPOGRAPHY - Bold & Modern ========== */

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 700;
    line-height: 1.1;
    color: var(--text);
    letter-spacing: -0.03em;
}

/* Display - Extra large headlines */
.display-xl {
    font-size: clamp(3.5rem, 10vw, 8rem);
    font-weight: 800;
    line-height: 0.95;
    letter-spacing: -0.04em;
}

.display-lg {
    font-size: clamp(2.5rem, 7vw, 5rem);
    font-weight: 800;
    line-height: 1;
    letter-spacing: -0.04em;
}

h1 { 
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 800;
}
h2 { 
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
}
h3 { 
    font-size: clamp(1.25rem, 3vw, 1.75rem);
    font-weight: 700;
}
h4 { 
    font-size: 1.25rem;
    font-weight: 600;
}
h5 { 
    font-size: 1rem;
    font-weight: 600;
}
h6 { 
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

p {
    margin-bottom: 1rem;
    color: var(--text-subtle);
    line-height: 1.7;
}

/* Lead paragraph */
.lead {
    font-size: 1.25rem;
    line-height: 1.6;
    color: var(--text-subtle);
}

/* Small/caption text */
.text-sm {
    font-size: 0.875rem;
}

.text-xs {
    font-size: 0.75rem;
    letter-spacing: 0.02em;
}

/* Overline/label text */
.overline {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted);
}

/* Links - Subtle underline animation */
a {
    color: var(--accent);
    text-decoration: none;
    position: relative;
    transition: color var(--dur-med) var(--ease-standard);
}

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

.particle-canvas {
    position: fixed;
}

/* Animated underline for text links */
.link-underline {
    position: relative;
}

.link-underline::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: -2px;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: width var(--dur-med) var(--ease-standard);
}

.link-underline:hover::after {
    width: 100%;
}

/* Gradient text utility */
.text-gradient {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Text balance for headlines */
.text-balance {
    text-wrap: balance;
}

/* ========== APP CONTAINER ========== */

html {
    view-transition-name: none;
}

#app {
    view-transition-name: app;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.view-container {
    flex: 1;
    display: flex;
    flex-direction: column;
}



/* ========== LOADING STATE ========== */

.loading-state {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    color: var(--text-muted);
}

.spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* ========== SCROLLBAR STYLING ========== */

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg);
}

::-webkit-scrollbar-thumb {
    background: var(--surface);
    border-radius: 4px;
    border: 2px solid var(--bg);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent);
}

/* ========== ANIMATIONS ========== */

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

@keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

/* ========== UTILITY CLASSES ========== */

.hidden { display: none !important; }
.invisible { visibility: hidden; }
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-primary { color: var(--text); }
.text-secondary { color: var(--text-subtle); }
.text-muted { color: var(--text-muted); }
.text-accent { color: var(--accent); }

.bg-primary { background-color: var(--bg); }
.bg-surface { background-color: var(--surface); }

.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 1rem; }
.mt-4 { margin-top: 1.5rem; }
.mt-5 { margin-top: 2rem; }

.mb-1 { margin-bottom: 0.25rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 1rem; }
.mb-4 { margin-bottom: 1.5rem; }
.mb-5 { margin-bottom: 2rem; }

.p-1 { padding: 0.25rem; }
.p-2 { padding: 0.5rem; }
.p-3 { padding: 1rem; }
.p-4 { padding: 1.5rem; }
.p-5 { padding: 2rem; }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: 0.25rem; }
.gap-2 { gap: 0.5rem; }
.gap-3 { gap: 1rem; }
.gap-4 { gap: 1.5rem; }

/* ========== THEME TOGGLE ========== */

.theme-toggle {
    /*position: fixed;*/
    /*bottom: 68px;*/
    /*right: 24px;*/
    /*z-index: 1000;*/
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background: var(--surface);
    border: 1px solid var(--border);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition:
        transform var(--dur-fast) var(--ease-standard),
        background-color var(--dur-med) var(--ease-standard),
        color var(--dur-med) var(--ease-standard),
        border-color var(--dur-med) var(--ease-standard),
        box-shadow var(--dur-med) var(--ease-standard);
    box-shadow: var(--shadow-2);
    color: var(--text);
}

.theme-toggle:hover {
    transform: translateY(var(--hover-lift)) scale(1.05);
    box-shadow: var(--glow);
}

.theme-toggle:focus-visible {
    outline: none;
    box-shadow: var(--ring);
}

.theme-toggle svg {
    width: 20px;
    height: 20px;
}

/* ========== RESPONSIVE BASE ========== */

@media (max-width: 768px) {
    html {
        font-size: 14px;
    }
    
    h1 { font-size: 2rem; }
    h2 { font-size: 1.5rem; }
    h3 { font-size: 1.25rem; }
}

@media (max-width: 480px) {
    html {
        font-size: 13px;
    }
    
    .theme-toggle {
        bottom: 16px;
        right: 16px;
        width: 44px;
        height: 44px;
    }
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        animation-duration: 1ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 1ms !important;
    }

    .reveal,
    .reveal-left,
    .reveal-right,
    .reveal-scale {
        opacity: 1 !important;
        transform: none !important;
    }
}