:root {
    --primary: #007AFF;
    --primary-hover: #0056CC;
    --secondary: #5856D6;
    --success: #34C759;
    --warning: #FF9500;
    --error: #FF3B30;
    --background: #FFFFFF;
    --background-secondary: #F5F5F7;
    --background-tertiary: #E8E8ED;
    --text: #1D1D1F;
    --text-secondary: #86868B;
    --text-tertiary: #6E6E73;
    --border: #D2D2D7;
    --border-focus: #007AFF;
    --input-bg: #FFFFFF;
    --input-bg-disabled: #F5F5F7;
    --button-text: #FFFFFF;
    --link: #007AFF;
}

[data-theme="dark"] {
    --primary: #0A84FF;
    --primary-hover: #409CFF;
    --secondary: #5E5CE6;
    --success: #30D158;
    --warning: #FF9F0A;
    --error: #FF453A;
    --background: #000000;
    --background-secondary: #1C1C1E;
    --background-tertiary: #2C2C2E;
    --text: #F5F5F7;
    --text-secondary: #98989D;
    --text-tertiary: #636366;
    --border: #38383A;
    --border-focus: #0A84FF;
    --input-bg: #1C1C1E;
    --input-bg-disabled: #2C2C2E;
    --button-text: #FFFFFF;
    --link: #0A84FF;
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --primary: #0A84FF;
        --primary-hover: #409CFF;
        --secondary: #5E5CE6;
        --success: #30D158;
        --warning: #FF9F0A;
        --error: #FF453A;
        --background: #000000;
        --background-secondary: #1C1C1E;
        --background-tertiary: #2C2C2E;
        --text: #F5F5F7;
        --text-secondary: #98989D;
        --text-tertiary: #636366;
        --border: #38383A;
        --border-focus: #0A84FF;
        --input-bg: #1C1C1E;
        --input-bg-disabled: #2C2C2E;
        --button-text: #FFFFFF;
        --link: #0A84FF;
    }
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display", "Helvetica Neue", Arial, sans-serif;
    background-color: var(--background);
    color: var(--text);
    line-height: 1.5;
    min-height: 100vh;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    max-width: 680px;
    margin: 0 auto;
    padding: 80px 20px;
}

.header {
    text-align: center;
    margin-bottom: 48px;
}

.header h1 {
    font-size: 32px;
    font-weight: 600;
    letter-spacing: -0.5px;
    margin-bottom: 8px;
}

.header p {
    font-size: 16px;
    color: var(--text-secondary);
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: var(--text);
    margin-bottom: 6px;
}

.input-wrapper {
    position: relative;
}

.input-wrapper input,
.input-wrapper select {
    width: 100%;
    padding: 14px 16px;
    font-size: 16px;
    font-family: inherit;
    background-color: var(--input-bg);
    color: var(--text);
    border: none;
    border-radius: 10px;
    outline: none;
    transition: background-color 0.2s ease;
}

.input-wrapper input:focus,
.input-wrapper select:focus {
    background-color: var(--input-bg);
}

.input-wrapper input::placeholder {
    color: var(--text-tertiary);
}

.input-wrapper input:disabled {
    background-color: var(--input-bg-disabled);
    cursor: not-allowed;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 20px;
    font-size: 16px;
    font-weight: 500;
    font-family: inherit;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
}

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

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

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-secondary {
    background-color: var(--background-tertiary);
    color: var(--primary);
}

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

.btn-text {
    background: none;
    color: var(--link);
    padding: 8px 12px;
}

.btn-text:hover {
    text-decoration: underline;
}

.btn-full {
    width: 100%;
}

.btn-group {
    display: flex;
    gap: 12px;
    margin-top: 24px;
}

.link-group {
    text-align: center;
    margin-top: 24px;
    font-size: 14px;
    color: var(--text-secondary);
}

.link-group a {
    color: var(--link);
    text-decoration: none;
    font-weight: 500;
}

.link-group a:hover {
    text-decoration: underline;
}

.divider {
    display: flex;
    align-items: center;
    margin: 24px 0;
    color: var(--text-tertiary);
    font-size: 14px;
}

.divider::before,
.divider::after {
    content: "";
    flex: 1;
    height: 1px;
    background-color: var(--border);
}

.divider span {
    padding: 0 16px;
}

.password-requirements {
    margin-top: 12px;
    padding: 12px;
    background-color: var(--background-secondary);
    border-radius: 8px;
}

.password-requirements p {
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.password-requirements p.valid {
    color: var(--success);
}

.password-requirements p::before {
    content: "✗ ";
}

.password-requirements p.valid::before {
    content: "✓ ";
}

.strength-bar {
    height: 4px;
    background-color: var(--background-tertiary);
    border-radius: 2px;
    margin-top: 8px;
    overflow: hidden;
}

.strength-bar-fill {
    height: 100%;
    width: 0%;
    transition: width 0.3s ease, background-color 0.3s ease;
}

.strength-bar-fill.weak { width: 20%; background-color: var(--error); }
.strength-bar-fill.medium { width: 50%; background-color: var(--warning); }
.strength-bar-fill.strong { width: 75%; background-color: var(--primary); }
.strength-bar-fill.very_strong { width: 100%; background-color: var(--success); }

.tabs {
    display: flex;
    background-color: var(--background-secondary);
    border-radius: 10px;
    padding: 4px;
    margin-bottom: 24px;
}

.tab {
    flex: 1;
    padding: 10px 16px;
    font-size: 14px;
    font-weight: 500;
    text-align: center;
    background: none;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    color: var(--text-secondary);
    transition: all 0.2s ease;
}

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

.tab:hover:not(.active) {
    color: var(--text);
}

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.modal-overlay.show {
    opacity: 1;
    visibility: visible;
}

.modal {
    background-color: var(--background);
    border-radius: 14px;
    padding: 24px;
    max-width: 400px;
    width: 90%;
    transform: scale(0.95);
    transition: transform 0.3s ease;
}

.modal-overlay.show .modal {
    transform: scale(1);
}

.modal h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
}

.modal p {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.modal .btn-group {
    margin-top: 16px;
}

.toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.toast {
    padding: 14px 20px;
    border-radius: 10px;
    font-size: 14px;
    font-weight: 500;
    background-color: var(--background-secondary);
    color: var(--text);
    transform: translateX(120%);
    transition: transform 0.3s ease;
    max-width: 320px;
}

.toast.show {
    transform: translateX(0);
}

.toast.success {
    background-color: var(--success);
    color: white;
}

.toast.error {
    background-color: var(--error);
    color: white;
}

.toast.warning {
    background-color: var(--warning);
    color: white;
}

.account-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 0;
    border-bottom: 1px solid var(--border);
    margin-bottom: 32px;
}

.account-info {
    display: flex;
    align-items: center;
    gap: 16px;
}

.avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background-color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 20px;
    font-weight: 600;
}

.account-details h2 {
    font-size: 18px;
    font-weight: 600;
}

.account-details p {
    font-size: 14px;
    color: var(--text-secondary);
}

.settings-section {
    margin-bottom: 32px;
}

.settings-section h3 {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 16px;
}

.settings-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 0;
    border-bottom: 1px solid var(--border);
}

.settings-item:last-child {
    border-bottom: none;
}

.settings-item-info {
    flex: 1;
}

.settings-item-info label {
    font-size: 14px;
    font-weight: 500;
    display: block;
    margin-bottom: 4px;
}

.settings-item-info span {
    font-size: 12px;
    color: var(--text-tertiary);
}

.theme-switcher {
    display: flex;
    gap: 8px;
}

.theme-option {
    padding: 8px 16px;
    font-size: 14px;
    background-color: var(--background-secondary);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    color: var(--text-secondary);
    transition: all 0.2s ease;
}

.theme-option.active {
    background-color: var(--primary);
    color: white;
}

.history-list {
    max-height: 300px;
    overflow-y: auto;
}

.history-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
    font-size: 14px;
}

.history-item:last-child {
    border-bottom: none;
}

.history-item .time {
    color: var(--text-secondary);
}

.history-item .device {
    color: var(--text-tertiary);
    font-size: 12px;
}

.page-redirect {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.redirect-box {
    text-align: center;
    max-width: 400px;
    padding: 40px;
}

.redirect-box h1 {
    font-size: 28px;
    font-weight: 600;
    margin-bottom: 24px;
    color: var(--success);
}

.redirect-box p {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.redirect-box .destination {
    font-weight: 500;
    color: var(--text);
}

.redirect-box .countdown {
    font-size: 48px;
    font-weight: 600;
    color: var(--primary);
    margin: 32px 0;
}

.redirect-box .manual-link {
    margin-top: 24px;
}

.select-wrapper {
    position: relative;
}

.select-wrapper select {
    appearance: none;
    cursor: pointer;
    padding-right: 40px;
}

.select-wrapper::after {
    content: "";
    position: absolute;
    right: 16px;
    top: 50%;
    transform: translateY(-50%);
    width: 0;
    height: 0;
    border-left: 5px solid transparent;
    border-right: 5px solid transparent;
    border-top: 5px solid var(--text-tertiary);
    pointer-events: none;
}

.hidden {
    display: none !important;
}

@media (max-width: 480px) {
    .container {
        padding: 60px 16px;
    }

    .header h1 {
        font-size: 26px;
    }

    .btn-group {
        flex-direction: column;
    }
}

/* Theme & Language Selector */
.preferences-bar {
    display: flex;
    justify-content: flex-end;
    padding: 16px 20px;
    gap: 12px;
}

.preferences-bar .theme-switcher,
.preferences-bar .language-switcher {
    display: flex;
    gap: 4px;
    background-color: var(--background-secondary);
    padding: 4px;
    border-radius: 8px;
}

.preferences-bar .theme-option,
.preferences-bar .language-option {
    padding: 8px 12px;
    font-size: 13px;
    border: none;
    background: none;
    color: var(--text-secondary);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.preferences-bar .theme-option:hover,
.preferences-bar .language-option:hover {
    color: var(--text);
}

.preferences-bar .theme-option.active,
.preferences-bar .language-option.active {
    background-color: var(--background);
    color: var(--text);
}