:root {
    --primary: #4A90E2;
    --secondary: #6C5CE7;
    --accent: #00CEC9;
    --success: #00B894;
    --warning: #FDCB6E;
    --danger: #D63031;
    --bg-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --card-bg: rgba(255, 255, 255, 0.95);
    --glass-bg: rgba(255, 255, 255, 0.25);
    --glass-border: rgba(255, 255, 255, 0.18);
    --text-dark: #2d3436;
    --text-muted: #636e72;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 8px 32px rgba(31, 38, 135, 0.37);
}

/* Dark Mode Variables */
[data-theme="dark"] {
    --bg-gradient: linear-gradient(135deg, #0f0c29 0%, #302b63 50%, #24243e 100%);
    --card-bg: rgba(30, 30, 40, 0.95);
    --glass-bg: rgba(40, 40, 50, 0.4);
    --glass-border: rgba(255, 255, 255, 0.1);
    --text-dark: #e8e8e8;
    --text-muted: #a0a0a0;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.6);
}

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

body {
    font-family: 'Inter', 'Segoe UI', Roboto, -apple-system, sans-serif;
    background: var(--bg-gradient);
    color: var(--text-dark);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    line-height: 1.6;
    transition: background 0.5s ease, color 0.3s ease;
}

.container {
    max-width: 1000px;
    /* Ancho ampliado para desktop */
    margin: 0 auto;
    padding: 20px;
    flex: 1;
    width: 95%;
    /* Asegurar margen en tablets */
}

/* Glass Card with enhanced effects */
.glass-card {
    background: var(--card-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: 24px;
    border: 1px solid var(--glass-border);
    box-shadow: var(--shadow-lg);
    padding: 24px;
    margin-bottom: 20px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    animation: fadeInUp 0.5s ease;
}

/* Layout de Carnet (2 Columnas en Desktop) */
@media (min-width: 850px) {
    .carnet-layout {
        display: grid;
        grid-template-columns: 320px 1fr;
        /* Columna Izq fija, Der flexible */
        gap: 40px;
        align-items: start;
    }

    .carnet-sidebar {
        position: sticky;
        /* Mantener perfil visible al scrollear */
        top: 20px;
    }

    /* Ajustar perfil para sidebar compacto */
    .pet-profile {
        margin-bottom: 30px;
    }

    .action-buttons {
        justify-content: center;
        flex-direction: column;
        /* Botones en columna en el sidebar */
    }
}

/* Glass Card Hover */
.glass-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(31, 38, 135, 0.5);
}

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Header with dark mode toggle */
.header {
    text-align: center;
    padding: 30px 0 20px;
    color: white;
    position: relative;
}

.header h1 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 8px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    animation: slideInDown 0.6s ease;
}

@keyframes slideInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.header p {
    font-size: 14px;
    opacity: 0.9;
}

/* Dark Mode Toggle */
.theme-toggle {
    position: absolute;
    top: 30px;
    right: 20px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(10px);
    border-radius: 50px;
    padding: 8px 16px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 20px;
}

.theme-toggle:hover {
    transform: scale(1.05);
    background: rgba(255, 255, 255, 0.3);
}

/* Action Buttons (QR, Share, Export) */
.action-buttons {
    display: flex;
    gap: 12px;
    justify-content: center;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.action-btn {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(10px);
    color: var(--text-dark);
    padding: 10px 20px;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    font-weight: 600;
}

.action-btn:hover {
    transform: translateY(-2px);
    background: rgba(255, 255, 255, 0.4);
    box-shadow: var(--shadow-md);
}

.action-btn:active {
    transform: translateY(0);
}

/* QR Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    z-index: 1000;
    justify-content: center;
    align-items: center;
    animation: fadeIn 0.3s ease;
}

.modal.active {
    display: flex;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

.modal-content {
    background: var(--card-bg);
    padding: 32px;
    border-radius: 24px;
    text-align: center;
    max-width: 90%;
    animation: scaleIn 0.3s ease;
}

@keyframes scaleIn {
    from {
        transform: scale(0.8);
        opacity: 0;
    }

    to {
        transform: scale(1);
        opacity: 1;
    }
}

.modal-close {
    position: absolute;
    top: 20px;
    right: 20px;
    background: rgba(255, 255, 255, 0.2);
    border: none;
    color: white;
    font-size: 24px;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.3s ease;
}

.modal-close:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: rotate(90deg);
}

#qrcode {
    margin: 20px auto;
    padding: 20px;
    background: white;
    border-radius: 16px;
    display: inline-block;
}

/* Search View */
.search-view {
    text-align: center;
}

.search-view h2 {
    color: var(--secondary);
    margin-bottom: 16px;
    font-size: 24px;
}

.search-input {
    width: 100%;
    padding: 16px 20px;
    font-size: 16px;
    border: 2px solid #e0e0e0;
    border-radius: 50px;
    text-align: center;
    margin-bottom: 16px;
    transition: all 0.3s ease;
    background: var(--card-bg);
    color: var(--text-dark);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(74, 144, 226, 0.1);
    transform: scale(1.02);
}

.btn {
    padding: 14px 32px;
    font-size: 16px;
    font-weight: 600;
    border: none;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-block;
    text-decoration: none;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.25);
}

.btn-block {
    width: 100%;
}

/* Pet Profile */
.pet-profile {
    text-align: center;
    margin-bottom: 24px;
}

.pet-avatar {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid white;
    box-shadow: var(--shadow-md);
    margin-bottom: 16px;
    transition: transform 0.3s ease;
    animation: bounceIn 0.6s ease;
}

@keyframes bounceIn {
    0% {
        transform: scale(0);
        opacity: 0;
    }

    50% {
        transform: scale(1.1);
    }

    100% {
        transform: scale(1);
        opacity: 1;
    }
}

.pet-avatar:hover {
    transform: scale(1.1) rotate(5deg);
}

.pet-name {
    font-size: 24px;
    font-weight: 700;
    color: var(--secondary);
    margin-bottom: 8px;
}

.pet-info {
    font-size: 14px;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
}

.pet-info span {
    display: flex;
    align-items: center;
    gap: 4px;
}

/* Next Vaccine Alert with enhanced animation */
.next-vaccine-alert {
    background: linear-gradient(135deg, rgba(74, 144, 226, 0.1), rgba(108, 92, 231, 0.1));
    border-radius: 16px;
    padding: 20px;
    margin-bottom: 24px;
    border-left: 4px solid var(--primary);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {

    0%,
    100% {
        box-shadow: 0 0 0 0 rgba(74, 144, 226, 0.4);
    }

    50% {
        box-shadow: 0 0 0 10px rgba(74, 144, 226, 0);
    }
}

.next-vaccine-alert.warning {
    background: linear-gradient(135deg, rgba(253, 203, 110, 0.15), rgba(253, 203, 110, 0.05));
    border-left-color: var(--warning);
}

.next-vaccine-alert.danger {
    background: linear-gradient(135deg, rgba(214, 48, 49, 0.15), rgba(214, 48, 49, 0.05));
    border-left-color: var(--danger);
    animation: shake 0.5s ease-in-out;
}

@keyframes shake {

    0%,
    100% {
        transform: translateX(0);
    }

    25% {
        transform: translateX(-10px);
    }

    75% {
        transform: translateX(10px);
    }
}

.next-vaccine-alert h3 {
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    margin-bottom: 12px;
}

.vaccine-countdown {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.vaccine-name {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-dark);
}

.countdown-badge {
    padding: 6px 16px;
    border-radius: 50px;
    font-size: 13px;
    font-weight: 600;
    color: white;
    animation: slideInRight 0.5s ease;
}

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

    to {
        transform: translateX(0);
        opacity: 1;
    }
}

.countdown-badge.success {
    background: var(--success);
}

.countdown-badge.warning {
    background: var(--warning);
}

.countdown-badge.danger {
    background: var(--danger);
}

.progress-bar-container {
    height: 8px;
    background: rgba(0, 0, 0, 0.1);
    border-radius: 50px;
    overflow: hidden;
    margin-top: 8px;
}

.progress-bar {
    height: 100%;
    border-radius: 50px;
    transition: width 1s ease;
    animation: progressGlow 2s ease-in-out infinite;
}

@keyframes progressGlow {

    0%,
    100% {
        filter: brightness(1);
    }

    50% {
        filter: brightness(1.2);
    }
}

.progress-bar.success {
    background: linear-gradient(90deg, var(--success), var(--accent));
}

.progress-bar.warning {
    background: linear-gradient(90deg, var(--warning), #FFA502);
}

.progress-bar.danger {
    background: linear-gradient(90deg, var(--danger), #E17055);
}

/* Tabs */
.tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 20px;
    border-bottom: 2px solid #e0e0e0;
}

.tab {
    flex: 1;
    padding: 12px;
    background: transparent;
    border: none;
    border-bottom: 3px solid transparent;
    font-size: 15px;
    font-weight: 600;
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
}

.tab::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    width: 0;
    height: 3px;
    background: var(--primary);
    transition: all 0.3s ease;
    transform: translateX(-50%);
}

.tab.active::after {
    width: 100%;
}

.tab.active {
    color: var(--primary);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeInUp 0.4s ease;
}

/* Info Grid */
.info-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    margin-bottom: 16px;
}

.info-item {
    background: rgba(0, 0, 0, 0.02);
    padding: 12px;
    border-radius: 12px;
    transition: all 0.3s ease;
}

[data-theme="dark"] .info-item {
    background: rgba(255, 255, 255, 0.05);
}

.info-item:hover {
    background: rgba(0, 0, 0, 0.05);
    transform: translateY(-2px);
}

[data-theme="dark"] .info-item:hover {
    background: rgba(255, 255, 255, 0.08);
}

.info-item.full-width {
    grid-column: 1 / -1;
}

.info-label {
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    margin-bottom: 4px;
}

.info-value {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-dark);
}

/* Vaccine List */
.vaccine-item {
    background: rgba(0, 0, 0, 0.02);
    border-radius: 12px;
    padding: 16px;
    margin-bottom: 12px;
    border-left: 4px solid var(--success);
    transition: all 0.3s ease;
    animation: slideInLeft 0.5s ease;
}

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

    to {
        transform: translateX(0);
        opacity: 1;
    }
}

.vaccine-item:hover {
    background: rgba(0, 0, 0, 0.04);
    transform: translateX(8px);
    box-shadow: var(--shadow-sm);
}

[data-theme="dark"] .vaccine-item {
    background: rgba(255, 255, 255, 0.05);
}

[data-theme="dark"] .vaccine-item:hover {
    background: rgba(255, 255, 255, 0.08);
}

.vaccine-item.warning {
    border-left-color: var(--warning);
}

.vaccine-item.danger {
    border-left-color: var(--danger);
}

.vaccine-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: 8px;
}

.vaccine-title {
    font-size: 16px;
    font-weight: 700;
    color: var(--text-dark);
}

.vaccine-status {
    padding: 4px 12px;
    border-radius: 50px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
}

.vaccine-status.success {
    background: rgba(0, 184, 148, 0.15);
    color: var(--success);
}

.vaccine-status.warning {
    background: rgba(253, 203, 110, 0.15);
    color: #D68910;
}

.vaccine-status.danger {
    background: rgba(214, 48, 49, 0.15);
    color: var(--danger);
}

.vaccine-details {
    font-size: 13px;
    color: var(--text-muted);
    line-height: 1.8;
}

.vaccine-details strong {
    color: var(--text-dark);
}

/* Loading */
.loading {
    text-align: center;
    padding: 20px;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(0, 0, 0, 0.1);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto;
}

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

/* Utilities */
.hidden {
    display: none !important;
}

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

.mt-2 {
    margin-top: 16px;
}

.mb-2 {
    margin-bottom: 16px;
}

/* Footer */
.footer {
    text-align: center;
    padding: 20px;
    color: rgba(255, 255, 255, 0.8);
    font-size: 13px;
}

/* Responsive */
@media (max-width: 480px) {
    .container {
        padding: 12px;
    }

    .glass-card {
        padding: 20px;
        border-radius: 20px;
    }

    .info-grid {
        grid-template-columns: 1fr;
    }

    .theme-toggle {
        top: 20px;
        right: 10px;
        padding: 6px 12px;
        font-size: 18px;
    }

    .action-buttons {
        gap: 8px;
    }

    .action-btn {
        padding: 8px 16px;
        font-size: 13px;
    }
}