:root {
    /* Paleta refinada */
    --primary-blue: #3b82f6;
    --primary-gradient: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
    --bg-dark: #020617;
    --card-bg: rgba(30, 41, 59, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
    --text-main: #f1f5f9;
    --text-muted: #94a3b8;
    --accent: #38bdf8;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;

    /* Efectos premium */
    --radius-lg: 1.6rem;
    --radius-md: 1rem;
    --shadow-premium: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 8px 10px -6px rgba(0, 0, 0, 0.5);
    --glass-blur: blur(12px);
    --modal-bg: rgba(15, 23, 42, 0.9);
}

/* --- Navigation --- */
.main-nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 1.5rem 4rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(2, 6, 23, 0.5);
    backdrop-filter: blur(8px);
    z-index: 1000;
    border-bottom: 1px solid var(--glass-border);
}

.nav-brand .brand-text {
    font-size: 2.2rem;
    font-weight: 800;
    letter-spacing: -1px;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

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

.nav-btn {
    background: transparent;
    border: 1px solid var(--glass-border);
    color: var(--text-main);
    padding: 0.8rem 1.6rem;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 1.4rem;
    font-weight: 600;
    transition: all 0.3s ease;
}

.nav-btn:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--accent);
}

.nav-btn.accent {
    background: var(--primary-gradient);
    border: none;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

/* --- Modals --- */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(4px);
    justify-content: center;
    align-items: center;
}

.modal.show {
    display: flex;
}

.modal-content {
    width: 100%;
    max-width: 42rem;
    padding: 3.5rem;
    border-radius: var(--radius-lg);
    position: relative;
    animation: modalIn 0.3s ease-out;
}

@keyframes modalIn {
    from {
        transform: scale(0.9);
        opacity: 0;
    }

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

.close-modal {
    position: absolute;
    right: 2rem;
    top: 1.5rem;
    font-size: 2.8rem;
    cursor: pointer;
    color: var(--text-muted);
}

.auth-form-container h2 {
    font-size: 2.4rem;
    margin-bottom: 2.5rem;
    text-align: center;
}

.input-group {
    margin-bottom: 2rem;
}

.input-group label {
    display: block;
    font-size: 1.4rem;
    margin-bottom: 0.8rem;
    color: var(--text-muted);
}

.input-group input {
    width: 100%;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    padding: 1.2rem;
    border-radius: var(--radius-md);
    color: var(--text-main);
    font-size: 1.5rem;
    outline: none;
    transition: all 0.3s ease;
}

.input-group input:focus {
    border-color: var(--accent);
    background: rgba(255, 255, 255, 0.08);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.switch-auth {
    margin-top: 2rem;
    text-align: center;
    font-size: 1.4rem;
    color: var(--text-muted);
}

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

.hidden {
    display: none !important;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-font-smoothing: antialiased;
}

html {
    font-size: 10px;
    font-family: 'Outfit', sans-serif;
}

body {
    background: radial-gradient(circle at top left, #1e293b 0%, #020617 100%);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2rem;
    line-height: 1.6;
}

.app-container {
    width: 100%;
    max-width: 48rem;
    display: flex;
    flex-direction: column;
    gap: 3rem;
    animation: fadeIn 0.8s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

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

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

.app-header h1 {
    font-size: 3.6rem;
    font-weight: 700;
    background: linear-gradient(to right, #f1f5f9, #38bdf8);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.8rem;
}

.app-header p {
    font-size: 1.6rem;
    color: var(--text-muted);
}

/* Glassmorphism Sections */
.password-display,
.controls-card {
    background: var(--card-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    box-shadow: var(--shadow-premium);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.password-display {
    padding: 3rem;
    border-radius: var(--radius-lg);
    position: relative;
    overflow: hidden;
}

.password-display::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--primary-gradient);
}

.result-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 2rem;
}

.password-text {
    font-size: 2.8rem;
    font-family: 'JetBrains Mono', monospace;
    font-weight: 600;
    letter-spacing: 0.1rem;
    word-break: break-all;
    user-select: all;
    color: var(--text-main);
}

.action-buttons {
    display: flex;
    gap: 1.2rem;
}

.action-buttons button {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-muted);
    cursor: pointer;
    padding: 1rem;
    border-radius: var(--radius-md);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    justify-content: center;
}

.action-buttons button:hover {
    color: var(--text-main);
    background-color: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
    border-color: var(--accent);
}

.save-label-group {
    margin-top: 1.5rem;
    display: flex;
    gap: 1rem;
    animation: fadeIn 0.3s ease;
}

.save-label-group input {
    flex: 1;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    padding: 0.8rem 1.2rem;
    border-radius: var(--radius-md);
    color: var(--text-main);
    font-size: 1.4rem;
    outline: none;
}

.save-label-group input:focus {
    border-color: var(--accent);
}

/* Strength Meter */
.strength-meter {
    margin-top: 2rem;
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

.strength-bar {
    height: 0.6rem;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 1rem;
    position: relative;
    overflow: hidden;
}

.strength-bar::after {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 0%;
    transition: width 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275), background-color 0.3s ease;
}

.strength-bar.weak::after {
    width: 25%;
    background-color: var(--danger);
}

.strength-bar.medium::after {
    width: 50%;
    background-color: var(--warning);
}

.strength-bar.strong::after {
    width: 75%;
    background-color: var(--primary-blue);
}

.strength-bar.very-strong::after {
    width: 100%;
    background-color: var(--success);
}

.strength-text {
    font-size: 1.2rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05rem;
    color: var(--text-muted);
}

.feedback-message {
    height: 2rem;
    font-size: 1.3rem;
    margin-top: 1rem;
    text-align: center;
    opacity: 0;
    transform: translateY(5px);
    transition: all 0.3s ease;
}

.feedback-message.show {
    opacity: 1;
    transform: translateY(0);
}

/* Panel de controles */
.controls-card {
    padding: 3.5rem;
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
    gap: 3rem;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.control-group label {
    font-size: 1.6rem;
    display: flex;
    justify-content: space-between;
    font-weight: 500;
    color: var(--text-muted);
}

.control-group label span {
    color: var(--accent);
    font-weight: 700;
}

/* Custom Range Input */
input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 0.4rem;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 1rem;
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 2.2rem;
    height: 2.2rem;
    background: var(--text-main);
    border: 3px solid var(--primary-blue);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 0 15px rgba(59, 130, 246, 0.3);
    transition: transform 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.15);
}

/* Options Grid */
.options-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2.5rem;
}

.checkbox-container {
    display: flex;
    align-items: center;
    position: relative;
    padding-left: 3.6rem;
    cursor: pointer;
    font-size: 1.5rem;
    font-weight: 400;
    color: var(--text-muted);
    transition: color 0.2s ease;
}

.checkbox-container:hover {
    color: var(--text-main);
}

.checkbox-container input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
}

.checkmark {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    left: 0;
    height: 2.2rem;
    width: 2.2rem;
    background-color: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    border-radius: 0.6rem;
    transition: all 0.3s ease;
}

.checkbox-container:hover input~.checkmark {
    border-color: var(--accent);
    background-color: rgba(255, 255, 255, 0.1);
}

.checkbox-container input:checked~.checkmark {
    background: var(--primary-gradient);
    border-color: transparent;
}

.checkbox-container input:checked~.checkmark::after {
    content: "";
    position: absolute;
    left: 0.7rem;
    top: 0.3rem;
    width: 0.5rem;
    height: 1rem;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

/* Primary Button */
.primary-button {
    background: var(--primary-gradient);
    color: white;
    border: none;
    padding: 1.8rem;
    border-radius: var(--radius-md);
    font-size: 1.6rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 10px 15px -3px rgba(37, 99, 235, 0.3);
}

.primary-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 20px -3px rgba(37, 99, 235, 0.4);
    filter: brightness(1.1);
}

.primary-button:active {
    transform: translateY(0);
}

/* --- View Overlays (Vault/Profile) --- */
.view-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1500;
    padding: 8rem 2rem 2rem;
    background: radial-gradient(circle at top left, #1e293b 0%, #020617 100%);
    overflow-y: auto;
    animation: slideUp 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes slideUp {
    from {
        transform: translateY(100%);
    }

    to {
        transform: translateY(0);
    }
}

.view-content {
    max-width: 90rem;
    margin: 0 auto;
    padding: 4rem;
    border-radius: var(--radius-lg);
    min-height: calc(100vh - 12rem);
    display: flex;
    flex-direction: column;
    gap: 3rem;
}

.view-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--glass-border);
    padding-bottom: 2rem;
}

.view-header h2 {
    font-size: 3rem;
    font-weight: 700;
}

/* Vault List */
.vault-controls {
    display: flex;
    gap: 2rem;
}

.vault-controls input {
    flex: 1;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    padding: 1.2rem 2rem;
    border-radius: var(--radius-md);
    color: var(--text-main);
    font-size: 1.6rem;
}

.vault-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(30rem, 1fr));
    gap: 2rem;
}

.password-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--glass-border);
    padding: 2.5rem;
    border-radius: var(--radius-md);
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    transition: all 0.3s ease;
}

.password-card:hover {
    border-color: var(--accent);
    background: rgba(255, 255, 255, 0.05);
    transform: translateY(-5px);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
}

.card-label {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-main);
}

.card-pass {
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.6rem;
    background: rgba(0, 0, 0, 0.2);
    padding: 1rem;
    border-radius: 0.6rem;
    word-break: break-all;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.delete-btn {
    color: var(--danger);
    cursor: pointer;
    background: transparent;
    border: none;
    font-size: 1.2rem;
    text-transform: uppercase;
    font-weight: 700;
}

/* Profile Section */
.profile-container {
    display: grid;
    grid-template-columns: 25rem 1fr;
    gap: 4rem;
}

.profile-avatar {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
}

.profile-avatar img {
    width: 18rem;
    height: 18rem;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid var(--accent);
    padding: 0.5rem;
    background: var(--bg-dark);
}

.edit-avatar {
    font-size: 1.3rem;
    color: var(--accent);
    background: transparent;
    border: 1px solid var(--accent);
    padding: 0.6rem 1.2rem;
    border-radius: 2rem;
    cursor: pointer;
}

/* --- Responsive Design --- */

/* Pantallas pequeñas (Móviles) */
@media (max-width: 480px) {
    html {
        font-size: 9px;
    }

    body {
        padding: 1.5rem;
    }

    .app-container {
        gap: 2rem;
    }

    .app-header h1 {
        font-size: 3rem;
    }

    .password-display {
        padding: 2rem;
    }

    .password-text {
        font-size: 2.2rem;
    }

    .controls-card {
        padding: 2.5rem;
        gap: 2.5rem;
    }

    .options-grid {
        grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr));
        gap: 2rem;
    }

    .checkbox-container {
        font-size: 1.6rem;
        padding: 1rem 0 1rem 3.8rem;
        min-height: 4rem;
        display: flex;
        align-items: center;
    }

    .primary-button {
        padding: 2rem;
        font-size: 1.8rem;
    }

    .action-buttons button {
        padding: 1.2rem;
    }
}

/* Pantallas extra pequeñas */
@media (max-width: 360px) {
    html {
        font-size: 8.5px;
    }

    .password-text {
        font-size: 2rem;
    }
}

/* Pantallas medianas (Tablets) */
@media (min-width: 481px) and (max-width: 768px) {
    .app-container {
        max-width: 90%;
    }
}

/* Orientación horizontal en móviles */
@media (max-height: 500px) and (orientation: landscape) {
    body {
        align-items: flex-start;
        padding: 1rem;
    }

    .app-container {
        flex-direction: row;
        max-width: 100%;
        align-items: flex-start;
    }

    .controls-card {
        flex: 1;
    }

    .password-display {
        flex: 0.8;
    }
}

/* Modal de Eliminación Específico */
#deleteModal .modal-content {
    transform: scale(0.9);
    transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

#deleteModal.show .modal-content {
    transform: scale(1);
}

.modal-actions {
    margin-top: 2rem;
}

.modal-actions .nav-btn {
    padding: 1rem 2rem;
    min-width: 120px;
}

.modal-actions .nav-btn:last-child:hover {
    background: #ff4d4d !important;
    border-color: #ff4d4d !important;
    box-shadow: 0 0 15px rgba(255, 71, 71, 0.4);
}