/* ==========================================================================
   base.css — design tokens + shared foundations for all pages
   ========================================================================== */

:root {
    /* Palette */
    --bg: #0a0f0d;
    --bg-elevated: #0d1311;
    --surface: #101714;
    --surface-hover: #141d19;
    --surface-inset: #0b100e;

    --border: rgba(160, 180, 170, 0.12);
    --border-strong: rgba(160, 180, 170, 0.22);

    --text-primary: #eef2f0;
    --text-secondary: #a9b8b0;
    --text-muted: #6e7f77;

    --accent: #34d399;
    --accent-strong: #10b981;
    --accent-soft: rgba(52, 211, 153, 0.1);
    --accent-glow: rgba(52, 211, 153, 0.22);

    --danger: #f87171;
    --danger-soft: rgba(248, 113, 113, 0.1);

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'SFMono-Regular', Consolas, 'Liberation Mono', monospace;

    /* Layout */
    --container: 1120px;
    --radius-sm: 8px;
    --radius: 14px;
    --radius-lg: 20px;

    --shadow-card: 0 1px 2px rgba(0, 0, 0, 0.4), 0 14px 40px rgba(0, 0, 0, 0.35);
    --shadow-glow: 0 0 0 1px var(--border-strong), 0 16px 48px rgba(0, 0, 0, 0.5), 0 0 32px var(--accent-soft);

    --transition-fast: 0.18s ease;
    --transition: 0.3s cubic-bezier(0.25, 0.6, 0.3, 1);
}

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-sans);
    line-height: 1.65;
    color: var(--text-secondary);
    background: var(--bg);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    animation: page-enter 0.45s ease both;
}

@keyframes page-enter {
    from { opacity: 0; }
    to { opacity: 1; }
}

h1, h2, h3, h4 {
    color: var(--text-primary);
    line-height: 1.2;
    font-weight: 700;
    letter-spacing: -0.02em;
}

img, svg, canvas {
    max-width: 100%;
    display: block;
}

a {
    color: var(--accent);
    text-decoration: none;
}

button {
    font-family: inherit;
}

::selection {
    background: var(--accent-glow);
    color: var(--text-primary);
}

:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
    border-radius: 4px;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

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

::-webkit-scrollbar-thumb {
    background: #26312c;
    border-radius: 5px;
    border: 2px solid var(--bg);
}

::-webkit-scrollbar-thumb:hover {
    background: #34423c;
}

/* ==========================================================================
   Shared components
   ========================================================================== */

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    font-size: 0.95rem;
    font-weight: 600;
    font-family: var(--font-sans);
    cursor: pointer;
    transition: transform var(--transition-fast), background var(--transition-fast),
                border-color var(--transition-fast), box-shadow var(--transition-fast),
                color var(--transition-fast);
    white-space: nowrap;
}

.btn:active {
    transform: translateY(1px);
}

.btn:disabled {
    opacity: 0.45;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.btn-primary {
    background: var(--accent-strong);
    color: #04120c;
}

.btn-primary:hover:not(:disabled) {
    background: var(--accent);
    box-shadow: 0 6px 24px var(--accent-glow);
}

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

.btn-secondary:hover:not(:disabled) {
    color: var(--text-primary);
    border-color: var(--accent);
    background: var(--accent-soft);
}

.btn-warning {
    background: transparent;
    color: #fbbf24;
    border-color: rgba(251, 191, 36, 0.4);
}

.btn-warning:hover:not(:disabled) {
    background: rgba(251, 191, 36, 0.1);
    border-color: #fbbf24;
}

/* Tech tag chips */
.tech-tag {
    display: inline-flex;
    align-items: center;
    background: var(--accent-soft);
    color: var(--accent);
    padding: 6px 14px;
    border-radius: 999px;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    border: 1px solid rgba(52, 211, 153, 0.25);
    transition: border-color var(--transition-fast), background var(--transition-fast);
}

.tech-tag:hover {
    border-color: var(--accent);
    background: rgba(52, 211, 153, 0.16);
}

/* Text inputs */
.field {
    width: 100%;
    padding: 13px 16px;
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-sm);
    background: var(--surface-inset);
    color: var(--text-primary);
    font-size: 1rem;
    font-family: var(--font-sans);
    outline: none;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.field::placeholder {
    color: var(--text-muted);
}

.field:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-soft);
}

/* Inline error message */
.error-message {
    margin-top: 1rem;
    padding: 12px 16px;
    background: var(--danger-soft);
    border: 1px solid rgba(248, 113, 113, 0.3);
    border-radius: var(--radius-sm);
    color: var(--danger);
    font-size: 0.92rem;
}

/* Three-dot loading indicator */
.loading {
    display: flex;
    justify-content: center;
    gap: 6px;
    margin-top: 1rem;
}

.loading span {
    width: 8px;
    height: 8px;
    background: var(--accent);
    border-radius: 50%;
    animation: loading-bounce 0.6s infinite alternate;
}

.loading span:nth-child(2) { animation-delay: 0.2s; }
.loading span:nth-child(3) { animation-delay: 0.4s; }

@keyframes loading-bounce {
    from { opacity: 0.3; transform: translateY(0); }
    to { opacity: 1; transform: translateY(-8px); }
}

/* Scroll-reveal: js/main.js applies .reveal-hidden up front and removes it
   when the element scrolls into view. Without JS, content stays visible. */
.reveal {
    transition: opacity 0.6s ease, transform 0.6s cubic-bezier(0.25, 0.6, 0.3, 1);
}

.reveal.reveal-hidden {
    opacity: 0;
    transform: translateY(24px);
}

/* Reduced motion: disable decorative animation, keep content visible */
@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    .reveal.reveal-hidden {
        opacity: 1;
        transform: none;
    }
}