:root {
    /* --- TEMA DARK (Por defecto) --- */
    --bg-main: #141619;
    --bg-gradient: radial-gradient(circle at top center, #1a2a3a 0%, #0f1214 80%);
    --text-main: #e0e0e0;
    --text-title: #ffffff;
    --text-muted: rgba(255, 255, 255, 0.7);
    --card-bg: rgba(20, 25, 30, 0.6);
    --card-border: rgba(0, 210, 255, 0.2);
    --card-hover-border: rgba(0, 210, 255, 0.5);
    --card-content: #d0d0d0;
    --cyan-primary: #00d2ff;
    --cyan-glow: rgba(0, 210, 255, 0.3);
    --input-bg: rgba(0, 0, 0, 0.3);
    --input-border: rgba(255, 255, 255, 0.2);
    --input-focus-bg: rgba(0, 0, 0, 0.5);
    --btn-glass-bg: rgba(255, 255, 255, 0.05);
    --btn-glass-border: rgba(255, 255, 255, 0.1);
    --btn-glass-hover-bg: rgba(255, 255, 255, 0.15);
    --shadow-color: rgba(0, 0, 0, 0.8);
    --modal-bg: #1a1d21;
    --modal-border: rgba(255, 255, 255, 0.1);
    --alert-success-bg: rgba(25, 135, 84, 0.2);
    --alert-success-text: #75b798;
    --alert-success-border: #198754;
    --ad-img-border: rgba(255, 255, 255, 0.1);
    --divider-color: rgba(255, 255, 255, 0.1);
}

[data-theme='light'] {
    /* --- TEMA LIGHT --- */
    --bg-main: #f8f9fa;
    --bg-gradient: radial-gradient(circle at top center, #e9ecef 0%, #f8f9fa 80%);
    --text-main: #212529;
    --text-title: #1a1d21;
    --text-muted: #6c757d;
    --card-bg: #ffffff;
    --card-border: #dee2e6;
    --card-hover-border: #00768a;
    --card-content: #495057;
    --cyan-primary: #00768a;
    --cyan-glow: transparent;
    --input-bg: #ffffff;
    --input-border: #ced4da;
    --input-focus-bg: #f8f9fa;
    --btn-glass-bg: #e9ecef;
    --btn-glass-border: #dee2e6;
    --btn-glass-hover-bg: #dee2e6;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --modal-bg: #ffffff;
    --modal-border: #dee2e6;
    --alert-success-bg: #d4edda;
    --alert-success-text: #155724;
    --alert-success-border: #c3e6cb;
    --ad-img-border: rgba(0, 0, 0, 0.1);
    --divider-color: rgba(0, 0, 0, 0.1);
}

body {
    background-color: var(--bg-main) !important;
    background-image: var(--bg-gradient) !important;
    color: var(--text-main);
    min-height: 100vh;
}

.tech-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
    overflow: hidden;
    box-shadow: 0 4px 15px var(--shadow-color);
}

.tech-card:hover {
    border-color: var(--card-hover-border);
    transform: translateY(-3px);
}

.btn-glass {
    background: var(--btn-glass-bg);
    color: var(--text-main);
    border: 1px solid var(--btn-glass-border);
}

.btn-glass:hover {
    background: var(--btn-glass-hover-bg);
    color: var(--cyan-primary);
}

.cat-badge {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--cyan-primary) !important;
    font-weight: bold;
}

.form-control,
.form-select {
    background: var(--input-bg) !important;
    border: 1px solid var(--input-border) !important;
    color: var(--text-main) !important;
}

.form-control:focus,
.form-select:focus {
    background: var(--input-focus-bg) !important;
    border-color: var(--cyan-primary) !important;
    color: var(--text-main) !important;
    box-shadow: 0 0 10px var(--cyan-glow) !important;
}

.form-control::placeholder {
    color: var(--text-muted) !important;
    opacity: 1;
}

.text-muted {
    color: var(--text-muted) !important;
}

.card-content {
    color: var(--card-content);
}

/* Modal de Imagen */
.modal-image-view {
    max-width: 100%;
    max-height: 85vh;
    object-fit: contain;
}

.cursor-zoom {
    cursor: zoom-in;
}

.ad-img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-bottom: 1px solid var(--ad-img-border);
    transition: opacity 0.3s;
}

.ad-img:hover {
    opacity: 0.8;
}

.section-divider {
    border-top: 1px solid var(--divider-color);
}

/* Theme Toggle */
.theme-toggle {
    position: fixed;
    top: 80px;
    right: 20px;
    width: 45px;
    height: 45px;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 1000;
    box-shadow: 0 4px 15px var(--shadow-color);
    transition: all 0.3s ease;
}

.theme-toggle:hover {
    transform: scale(1.1);
}

.theme-toggle i {
    font-size: 1.2rem;
    color: var(--cyan-primary);
}

/* Modales */
.tm-modal {
    background-color: var(--modal-bg) !important;
    color: var(--text-main) !important;
    border: 1px solid var(--modal-border) !important;
}

.tm-modal .modal-header,
.tm-modal .modal-footer {
    border-color: var(--divider-color) !important;
}

.tm-modal .btn-close {
    filter: var(--close-filter);
}

[data-theme='dark'] {
    --close-filter: invert(1) grayscale(100%) brightness(200%);
}

[data-theme='light'] {
    --close-filter: none;
}

/* Alerts custom colors */
.alert-success-custom {
    background: var(--alert-success-bg) !important;
    color: var(--alert-success-text) !important;
    border-left: 4px solid var(--alert-success-border) !important;
    border-top: 0 !important;
    border-right: 0 !important;
    border-bottom: 0 !important;
}

/* Content Wrapper */
.content-wrapper {
    max-width: 1400px;
    margin: 0 auto;
}

[data-theme='light'] .text-info {
    color: var(--cyan-primary) !important;
}

[data-theme='light'] .btn-info {
    background-color: var(--cyan-primary);
    border-color: var(--cyan-primary);
    color: #ffffff;
}

[data-theme='light'] .btn-outline-info {
    color: var(--cyan-primary);
    border-color: var(--cyan-primary);
}

[data-theme='light'] .btn-outline-info:hover {
    background-color: var(--cyan-primary);
    color: #ffffff;
}