/* ============================================================
   TRAS EL RASTRO — Shared Stylesheet
   Only global styles used across all pages.
   Page-specific CSS is embedded inline in each PHP file.
   Aesthetic: Dark Noir Detective / Dossier
   ============================================================ */

:root {
    --bg-deep:      #08080a;
    --bg-surface:   #0e0e11;
    --bg-card:      #141418;
    --bg-elevated:  #1a1a1f;
    --bg-input:     #0b0b0e;

    --text-primary:   #e8e0d0;
    --text-secondary: #9a9084;
    --text-muted:     #5c564e;

    --crimson:       #8b1a1a;
    --crimson-light: #b52a2a;
    --crimson-glow:  rgba(139, 26, 26, 0.15);

    --gold:          #c4a04e;
    --gold-dim:      #8a7235;
    --gold-glow:     rgba(196, 160, 78, 0.1);

    --forest:        #2d5a2d;
    --forest-light:  #4a8a4a;

    --border:        rgba(232, 224, 208, 0.06);
    --border-hover:  rgba(232, 224, 208, 0.12);
    --border-gold:   rgba(196, 160, 78, 0.15);

    --font-display: 'Playfair Display', Georgia, serif;
    --font-mono:    'DM Mono', 'Courier New', monospace;
    --font-body:    'Libre Baskerville', Georgia, serif;

    --radius-sm: 2px;
    --radius-md: 4px;
    --radius-lg: 6px;

    --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
    --shadow-lg: 0 8px 30px rgba(0,0,0,0.5);
    --shadow-glow-crimson: 0 0 30px rgba(139,26,26,0.2);
    --shadow-glow-gold: 0 0 30px rgba(196,160,78,0.15);
}

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

html { scroll-behavior: smooth; }

body {
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-deep);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

a { color: var(--gold); text-decoration: none; transition: color 0.3s; }
a:hover { color: var(--gold-dim); }

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

/* === GRAIN OVERLAY === */
.grain-overlay {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 9999;
    opacity: 0.025;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 512 512' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ============================================================
   HEADER
   ============================================================ */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(8, 8, 10, 0.92);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
}

.header-inner {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0.9rem 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    color: var(--text-primary);
    text-decoration: none;
}

.logo-fingerprint {
    color: var(--crimson-light);
    transition: transform 0.4s ease;
}

.logo:hover .logo-fingerprint { transform: rotate(15deg) scale(1.05); }

.logo-title {
    font-family: var(--font-display);
    font-weight: 900;
    font-size: 1.35rem;
    letter-spacing: 0.04em;
    display: block;
    line-height: 1.1;
}

.logo-sub {
    font-family: var(--font-mono);
    font-size: 0.6rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--text-muted);
    display: block;
}

/* Nav */
.main-nav {
    display: flex;
    align-items: center;
    gap: 1.2rem;
}

.nav-link {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-secondary);
    padding: 0.5rem 0.8rem;
    transition: all 0.3s;
    border: 1px solid transparent;
}

.nav-link:hover {
    color: var(--text-primary);
}

.nav-link.active {
    color: var(--gold);
    border-bottom: 1px solid var(--gold);
}

.nav-logout {
    color: var(--crimson-light) !important;
    opacity: 0.7;
}

.nav-logout:hover { opacity: 1; }

.btn-nav-register {
    background: var(--crimson);
    border: 1px solid var(--crimson) !important;
    color: var(--text-primary) !important;
    padding: 0.5rem 1.2rem !important;
    border-radius: var(--radius-sm);
}

.btn-nav-register:hover {
    background: var(--crimson-light);
    box-shadow: var(--shadow-glow-crimson);
}

.nav-user {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding-left: 1rem;
    border-left: 1px solid var(--border);
}

.user-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--crimson), var(--gold-dim));
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 0.8rem;
    color: var(--text-primary);
}

.user-name {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--text-secondary);
    letter-spacing: 0.05em;
}

/* Mobile toggle */
.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.mobile-toggle span {
    width: 22px;
    height: 1.5px;
    background: var(--text-secondary);
    transition: 0.3s;
}

/* ============================================================
   FLASH MESSAGES
   ============================================================ */
.flash-message {
    padding: 0;
    border-bottom: 1px solid var(--border);
}

.flash-inner {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0.8rem 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-family: var(--font-mono);
    font-size: 0.78rem;
    letter-spacing: 0.05em;
}

.flash-inner button {
    background: none;
    border: none;
    color: inherit;
    cursor: pointer;
    font-size: 1rem;
    opacity: 0.6;
}

.flash-inner button:hover { opacity: 1; }

.flash-success { background: rgba(45, 90, 45, 0.15); color: var(--forest-light); }
.flash-error   { background: rgba(139, 26, 26, 0.15); color: var(--crimson-light); }
.flash-info    { background: rgba(196, 160, 78, 0.1); color: var(--gold); }

/* ============================================================
   MAIN CONTAINER
   ============================================================ */
.main-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 2rem;
    min-height: calc(100vh - 180px);
}


/* Form elements */
.form-group {
    margin-bottom: 1.2rem;
}

.form-label {
    display: block;
    font-family: var(--font-mono);
    font-size: 0.68rem;
    font-weight: 500;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--gold-dim);
    margin-bottom: 0.4rem;
}

.form-input {
    width: 100%;
    background: var(--bg-input);
    border: 1px solid var(--border);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 0.95rem;
    padding: 0.75rem 1rem;
    border-radius: var(--radius-sm);
    transition: all 0.3s;
    outline: none;
}

.form-input:focus {
    border-color: var(--gold-dim);
    box-shadow: 0 0 0 2px var(--gold-glow);
}

.form-input::placeholder {
    color: var(--text-muted);
    font-style: italic;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.form-select {
    width: 100%;
    background: var(--bg-input);
    border: 1px solid var(--border);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 0.95rem;
    padding: 0.75rem 1rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.3s;
    outline: none;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg width='10' height='6' viewBox='0 0 10 6' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1L5 5L9 1' stroke='%239a9084' stroke-width='1.5' stroke-linecap='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
}

.form-select:focus {
    border-color: var(--gold-dim);
    box-shadow: 0 0 0 2px var(--gold-glow);
}

.form-select option { background: var(--bg-card); color: var(--text-primary); }

.form-textarea {
    width: 100%;
    background: var(--bg-input);
    border: 1px solid var(--border);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 0.95rem;
    padding: 0.75rem 1rem;
    border-radius: var(--radius-sm);
    transition: all 0.3s;
    outline: none;
    resize: vertical;
    min-height: 100px;
    line-height: 1.6;
}

.form-textarea:focus {
    border-color: var(--gold-dim);
    box-shadow: 0 0 0 2px var(--gold-glow);
}

/* Checkbox */
.form-check {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    cursor: pointer;
}

.form-check input[type="checkbox"] {
    width: 16px;
    height: 16px;
    accent-color: var(--crimson);
    cursor: pointer;
}

.form-check span {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    font-weight: 500;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    padding: 0.8rem 1.5rem;
    border-radius: var(--radius-sm);
    border: 1px solid;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
}

.btn-primary {
    background: var(--crimson);
    border-color: var(--crimson);
    color: var(--text-primary);
}

.btn-primary:hover {
    background: var(--crimson-light);
    box-shadow: var(--shadow-glow-crimson);
    transform: translateY(-1px);
    color: var(--text-primary);
}

.btn-gold {
    background: linear-gradient(135deg, var(--gold), var(--gold-dim));
    border-color: var(--gold-dim);
    color: var(--bg-deep);
    font-weight: 500;
}

.btn-gold:hover {
    box-shadow: var(--shadow-glow-gold);
    transform: translateY(-1px);
    color: var(--bg-deep);
}

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

.btn-ghost:hover {
    border-color: var(--gold-dim);
    color: var(--gold);
}

.btn-success {
    background: var(--forest);
    border-color: var(--forest);
    color: #c0e8c0;
}

.btn-success:hover {
    background: var(--forest-light);
    box-shadow: 0 0 20px rgba(45, 90, 45, 0.2);
}

.btn-block {
    width: 100%;
    padding: 0.9rem;
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 0.78rem;
}

.btn-sm {
    padding: 0.4rem 0.8rem;
    font-size: 0.65rem;
}

.btn-danger {
    background: transparent;
    border-color: rgba(139,26,26,0.3);
    color: var(--crimson-light);
}

.btn-danger:hover {
    background: var(--crimson);
    border-color: var(--crimson);
    color: var(--text-primary);
}


/* Cases Grid & Section Header — shared by index and admin */
.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.5rem;
    padding-bottom: 0.8rem;
    border-bottom: 1px solid var(--border);
}

.section-title {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
}

.section-label {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--text-muted);
}

.badge {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.58rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    padding: 0.2rem 0.6rem;
    border-radius: var(--radius-sm);
}

.badge-easy   { background: rgba(45,90,45,0.2); color: var(--forest-light); }
.badge-medium { background: rgba(196,160,78,0.15); color: var(--gold); }
.badge-hard   { background: rgba(139,26,26,0.2); color: var(--crimson-light); }

.badge-type {
    background: var(--bg-surface);
    color: var(--text-secondary);
    border: 1px solid var(--border);
}

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
    border-top: 1px solid var(--border);
    padding: 2rem 0;
    margin-top: 3rem;
}

.footer-inner {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-brand p {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 0.2rem;
}

.footer-links {
    display: flex;
    gap: 1.5rem;
}

.footer-links a {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-muted);
}

.footer-links a:hover { color: var(--text-secondary); }

.footer-copy {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: var(--text-muted);
    letter-spacing: 0.05em;
}


/* ============================================================
   ANIMATIONS
   ============================================================ */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(15px); }
    to   { opacity: 1; transform: translateY(0); }
}

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

.fade-in-up {
    animation: fadeInUp 0.5s ease forwards;
    opacity: 0;
}

.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }
.delay-4 { animation-delay: 0.4s; }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 768px) {
    .header-inner { padding: 0.8rem 1.2rem; }

    .mobile-toggle { display: flex; }

    .main-nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--bg-surface);
        border-bottom: 1px solid var(--border);
        flex-direction: column;
        padding: 1rem;
        gap: 0.5rem;
    }

    .main-nav.open { display: flex; }

    .nav-user {
        border-left: none;
        padding-left: 0;
        padding-top: 0.8rem;
        border-top: 1px solid var(--border);
    }

    .main-container { padding: 1.2rem; }

    .form-row { grid-template-columns: 1fr; }

    .footer-inner { flex-direction: column; text-align: center; }
}

/* ============================================================
   SCROLLBAR
   ============================================================ */
::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(196,160,78,0.15); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(196,160,78,0.3); }

/* ============================================================
   SELECTION
   ============================================================ */
::selection {
    background: rgba(139, 26, 26, 0.3);
    color: var(--text-primary);
}