/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: 10px 20px;
    border: none;
    border-radius: var(--radius-full);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    white-space: nowrap;
    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, 0.2);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

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

.btn-primary {
    background: var(--gradient-1);
    color: var(--white);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.btn-outline {
    background: var(--white);
    color: var(--primary-solid);
    border: 2px solid var(--white);
}

.btn-outline:hover {
    background: transparent;
    color: var(--white);
}

.btn-ghost {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 2px solid var(--gray-300);
}

.btn-ghost:hover {
    background: var(--primary-solid);
    color: var(--white);
    border-color: var(--primary-solid);
    transform: translateY(-2px);
}

.btn-danger {
    background: linear-gradient(135deg, #ff4757, #e84393);
    color: var(--white);
    box-shadow: var(--shadow-md);
}

.btn-danger:hover {
    background: linear-gradient(135deg, #e84118, #c23875);
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.btn-full {
    width: 100%;
}

.btn-hero {
    padding: 16px 32px;
    font-size: 18px;
}

/* Forms */
.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
}

@media (max-width: 768px) {
    .form-row {
        grid-template-columns: 1fr;
    }
}

.form-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 600;
    color: var(--text-primary);
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--gray-300);
    border-radius: var(--radius-md);
    font-size: 16px;
    font-family: inherit;
    transition: all var(--transition-base);
    background: var(--bg-primary);
    color: var(--text-primary);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--primary-solid);
    box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.1);
}

.form-textarea {
    resize: vertical;
    min-height: 100px;
}

.form-hint {
    font-size: 14px;
    color: var(--gray-600);
}

.phone-input-group {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.phone-prefix {
    background: var(--gray-100);
    padding: 12px 16px;
    border-radius: var(--radius-md);
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
}

.phone-input-group .form-input {
    flex: 1;
}

.password-input-group {
    position: relative;
}

.password-input-group .form-input {
    padding-right: 45px;
}

.password-toggle {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--gray-600);
    cursor: pointer;
    font-size: 18px;
    transition: color var(--transition-base);
}

.password-toggle:hover {
    color: var(--primary-solid);
}

/* Gender Selection */
.gender-group {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
}

.gender-option input[type="radio"] {
    display: none;
}

.gender-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-xl);
    border: 3px solid var(--gray-300);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-base);
    background: var(--white);
}

.gender-option:first-child .gender-card {
    background: var(--gradient-male);
    color: var(--white);
    border-color: transparent;
}

.gender-option:last-child .gender-card {
    background: var(--gradient-female);
    color: var(--white);
    border-color: transparent;
}

.gender-card i {
    font-size: 32px;
}

.gender-card span {
    font-weight: 600;
    font-size: 18px;
}

.gender-option input[type="radio"]:checked + .gender-card {
    border-color: var(--primary-solid);
    box-shadow: var(--shadow-lg);
    transform: scale(1.05);
}

/* Toggle Switch */
.toggle-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md);
    background: var(--bg-primary);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background var(--transition-base);
}

.toggle-item:hover {
    background: var(--bg-secondary);
}

.toggle-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 500;
}

.toggle-switch {
    position: relative;
    width: 50px;
    height: 26px;
    appearance: none;
    background: var(--gray-300);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: background var(--transition-base);
}

.toggle-switch::before {
    content: '';
    position: absolute;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    top: 2px;
    right: 2px;
    background: var(--white);
    transition: all var(--transition-base);
}

.toggle-switch:checked {
    background: var(--primary-solid);
}

.toggle-switch:checked::before {
    right: 26px;
}

/* Cards */
.card {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    transition: box-shadow var(--transition-base);
}

.card:hover {
    box-shadow: var(--shadow-lg);
}

/* Badge */
.badge {
    position: absolute;
    top: -4px;
    left: -4px;
    background: var(--danger);
    color: var(--white);
    font-size: 11px;
    padding: 2px 6px;
    border-radius: var(--radius-full);
    font-weight: bold;
    min-width: 18px;
    text-align: center;
}

/* Alert / Modal System */
.modal-backdrop {
    position: fixed;
    inset: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(10, 10, 30, 0.55);
    backdrop-filter: blur(6px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
    min-height: 100vh;
    z-index: 9999;
    animation: fadeIn 0.25s ease forwards;
}

@supports (height: 100dvh) {
    .modal-backdrop {
        height: 100dvh;
        min-height: 100dvh;
    }
}

@media (max-width: 600px) {
    .modal-backdrop {
        padding: var(--spacing-md);
    }
    .alert-modal {
        width: min(360px, calc(100% - var(--spacing-md) * 2));
        margin: 0 auto;
        max-height: calc(100vh - var(--spacing-lg) * 2);
        overflow-y: auto;
    }
    @supports (height: 100dvh) {
        .alert-modal {
            max-height: calc(100dvh - var(--spacing-lg) * 2);
        }
    }
}

body[data-modal-open="true"] {
    overflow: hidden;
}

.alert-modal {
    background: var(--bg-primary);
    color: var(--text-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    width: min(420px, 100%);
    padding: var(--spacing-xl) var(--spacing-lg);
    position: relative;
    animation: scaleIn 0.25s ease forwards;
    text-align: center;
}

.alert-modal::after {
    content: '';
    position: absolute;
    inset: -2px;
    border-radius: inherit;
    padding: 2px;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.25), rgba(118, 75, 162, 0.25));
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    pointer-events: none;
}

.alert-modal .modal-close {
    position: absolute;
    top: var(--spacing-sm);
    left: var(--spacing-sm);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background var(--transition-fast), color var(--transition-fast);
}

.alert-modal .modal-close:hover {
    background: rgba(102, 126, 234, 0.1);
    color: var(--primary-solid);
}

.alert-icon {
    width: 72px;
    height: 72px;
    border-radius: 24px;
    margin: 0 auto var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 30px;
    color: #fff;
    box-shadow: 0 16px 30px rgba(102, 126, 234, 0.25);
}

.alert-modal.success .alert-icon {
    background: linear-gradient(135deg, #4ecdc4, #2ab7a9);
    box-shadow: 0 16px 30px rgba(78, 205, 196, 0.25);
}

.alert-modal.error .alert-icon {
    background: linear-gradient(135deg, #f5576c, #f093fb);
    box-shadow: 0 16px 30px rgba(245, 87, 108, 0.25);
}

.alert-modal.warning .alert-icon {
    background: linear-gradient(135deg, #ffa726, #fdd835);
    box-shadow: 0 16px 30px rgba(255, 167, 38, 0.25);
}

.alert-modal.info .alert-icon {
    background: linear-gradient(135deg, #667eea, #764ba2);
}

.alert-modal h3 {
    font-size: 1.35rem;
    margin-bottom: var(--spacing-sm);
    font-weight: 700;
}

.alert-modal p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.8;
    font-size: 0.98rem;
}

.modal-actions {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
    width: 100%;
}

.modal-actions .btn {
    min-width: 140px;
    justify-content: center;
    flex: 1 1 auto;
}

.modal-actions .btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid rgba(102, 126, 234, 0.2);
}

.modal-actions .btn-secondary:hover {
    background: rgba(102, 126, 234, 0.1);
}

.modal-backdrop.closing {
    animation: fadeOut 0.2s ease forwards;
}

.alert-modal.closing {
    animation: scaleOut 0.2s ease forwards;
}

@keyframes scaleIn {
    from {
        transform: translateY(20px) scale(0.92);
        opacity: 0;
    }
    to {
        transform: translateY(0) scale(1);
        opacity: 1;
    }
}

@keyframes scaleOut {
    from {
        transform: translateY(0) scale(1);
        opacity: 1;
    }
    to {
        transform: translateY(10px) scale(0.95);
        opacity: 0;
    }
}

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