@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

:root {
    --accent: #6366f1;
    --accent-2: #8b5cf6;
    --accent-3: #4f46e5;
    --accent-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    --accent-gradient-2: linear-gradient(135deg, #6366f1 0%, #4f46e5 100%);
    --accent-glow: rgba(99, 102, 241, 0.3);
    --accent-glow-soft: rgba(99, 102, 241, 0.1);
    --bg: #0c0c1a;
    --bg-2: #141425;
    --surface: rgba(255, 255, 255, 0.04);
    --surface-2: rgba(255, 255, 255, 0.06);
    --surface-hover: rgba(255, 255, 255, 0.08);
    --surface-input: rgba(255, 255, 255, 0.03);
    --text: #f0f0ff;
    --text-2: #a0a0c8;
    --text-3: #606090;
    --border: rgba(255, 255, 255, 0.06);
    --border-hover: rgba(255, 255, 255, 0.12);
    --border-accent: rgba(99, 102, 241, 0.4);
    --success: #34d399;
    --success-bg: rgba(52, 211, 153, 0.08);
    --error: #f87171;
    --error-bg: rgba(248, 113, 113, 0.08);
    --warning: #fbbf24;
    --shadow-sm: 0 2px 12px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 8px 32px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.15);
    --radius-xs: 8px;
    --radius-sm: 12px;
    --radius-md: 16px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --radius-full: 9999px;
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --t-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --t-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --t-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    --max-width: 1140px;
    --navbar-height: 68px;
}

body {
    background: var(--bg);
    background-image: 
        radial-gradient(ellipse at 30% 40%, rgba(99, 102, 241, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 70% 60%, rgba(139, 92, 246, 0.08) 0%, transparent 50%);
}

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

html {
    scroll-behavior: smooth;
}

body {
    background: var(--bg);
    color: var(--text);
    font-family: var(--font);
    font-size: 15px;
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
    position: relative;
}

body::before {
    content: '';
    position: fixed;
    inset: 0;
    background:
        radial-gradient(ellipse 80% 60% at 20% 0%, rgba(124, 92, 252, 0.15), transparent 50%),
        radial-gradient(ellipse 70% 50% at 80% 20%, rgba(232, 85, 142, 0.1), transparent 50%),
        radial-gradient(ellipse 60% 50% at 50% 100%, rgba(92, 225, 230, 0.08), transparent 50%);
    z-index: -2;
    pointer-events: none;
}

body::after {
    content: '';
    position: fixed;
    inset: 0;
    background-image:
        radial-gradient(circle at 1px 1px, rgba(255, 255, 255, 0.015) 1px, transparent 0);
    background-size: 32px 32px;
    z-index: -1;
    pointer-events: none;
}

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-full);
    border: 2px solid transparent;
    background-clip: padding-box;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.2);
    background-clip: padding-box;
}

::selection {
    background: var(--accent);
    color: #fff;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

.navbar {
    background: rgba(11, 12, 20, 0.7);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 1000;
    height: var(--navbar-height);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    height: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--text);
    text-decoration: none;
    letter-spacing: -0.5px;
    transition: opacity var(--t-fast);
}

.nav-brand:hover {
    opacity: 0.85;
}

.nav-brand i {
    font-size: 1.35rem;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    filter: drop-shadow(0 0 8px var(--accent-glow));
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 2px;
    height: 100%;
}

.nav-link {
    color: var(--text-2);
    text-decoration: none;
    padding: 8px 14px;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 500;
    transition: all var(--t-base);
    display: flex;
    align-items: center;
    gap: 7px;
    position: relative;
    height: 40px;
}

.nav-link i {
    font-size: 0.95rem;
    transition: transform var(--t-fast);
}

.nav-link:hover {
    color: var(--text);
    background: var(--surface);
}

.nav-link:hover i {
    transform: translateY(-1px);
}

.nav-link.active {
    color: var(--text);
    background: var(--surface-2);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 4px;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 2px;
    background: var(--accent-gradient);
    border-radius: var(--radius-full);
    box-shadow: 0 0 8px var(--accent-glow);
}

.nav-link-primary {
    background: var(--accent-gradient);
    color: #fff;
    padding: 9px 22px;
    border-radius: var(--radius-full);
    font-weight: 600;
    box-shadow: 0 4px 16px var(--accent-glow);
}

.nav-link-primary:hover {
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 8px 24px var(--accent-glow);
    background: var(--accent-gradient);
}

.nav-link-primary i {
    color: #fff;
}

.nav-user {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-2);
    font-size: 0.85rem;
    font-weight: 500;
    padding: 0 10px;
}

.nav-user i {
    font-size: 1.2rem;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.badge {
    background: var(--accent-gradient);
    color: #fff;
    font-size: 0.65rem;
    font-weight: 700;
    padding: 2px 7px;
    border-radius: var(--radius-full);
    margin-left: 2px;
    box-shadow: 0 0 12px var(--accent-glow);
    min-width: 18px;
    text-align: center;
}

.hero {
    text-align: center;
    padding: 72px 24px 48px;
    position: relative;
}

.hero-icon {
    font-size: 3.5rem;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 20px;
    display: inline-block;
    filter: drop-shadow(0 0 24px var(--accent-glow));
    animation: floatIcon 4s ease-in-out infinite;
}

@keyframes floatIcon {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}

.hero h1 {
    font-size: 3.2rem;
    font-weight: 800;
    letter-spacing: -1.5px;
    margin-bottom: 12px;
    color: var(--text);
    line-height: 1.1;
    background: linear-gradient(135deg, #fff 0%, #a8adc0 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    font-size: 1.15rem;
    color: var(--text-2);
    max-width: 520px;
    margin: 0 auto;
    font-weight: 400;
}

.send-wrapper {
    display: grid;
    grid-template-columns: 1.6fr 1fr;
    gap: 28px;
    margin-top: 8px;
    padding-bottom: 60px;
}

.card {
    background: var(--surface);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-radius: var(--radius-lg);
    padding: 32px;
    border: 1px solid var(--border);
    transition: all var(--t-base);
    box-shadow: var(--shadow-md);
}

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

.card-header {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 28px;
    padding-bottom: 18px;
    border-bottom: 1px solid var(--border);
}

.card-header i {
    font-size: 1.3rem;
    color: #fff;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-gradient);
    border-radius: var(--radius-sm);
    box-shadow: 0 4px 16px var(--accent-glow);
}

.card-header h2 {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text);
    letter-spacing: -0.3px;
}

.form-group {
    margin-bottom: 22px;
}

.form-group label {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
    color: var(--text-2);
    font-weight: 500;
    font-size: 0.82rem;
    letter-spacing: 0.3px;
    text-transform: uppercase;
}

.form-group label i {
    color: var(--accent);
    font-size: 0.85rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 14px 18px;
    background: var(--surface-input);
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-size: 0.95rem;
    font-family: var(--font);
    transition: all var(--t-base);
    outline: none;
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 4px var(--accent-glow-soft);
    background: var(--surface-2);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-3);
}

.form-group textarea {
    resize: vertical;
    min-height: 140px;
    line-height: 1.7;
}

.hint {
    display: block;
    margin-top: 6px;
    font-size: 0.75rem;
    color: var(--text-3);
}

.char-counter {
    text-align: right;
    font-size: 0.78rem;
    color: var(--text-3);
    margin-top: 6px;
    font-weight: 500;
}

.char-counter.warning {
    color: var(--warning);
}

.btn-submit {
    width: 100%;
    padding: 15px;
    background: var(--accent-gradient);
    color: #fff;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-weight: 600;
    font-family: var(--font);
    cursor: pointer;
    transition: all var(--t-base);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    box-shadow: 0 4px 20px var(--accent-glow);
    position: relative;
    overflow: hidden;
}

.btn-submit::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255,255,255,0.15), transparent);
    opacity: 0;
    transition: opacity var(--t-base);
}

.btn-submit:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 32px var(--accent-glow);
}

.btn-submit:hover:not(:disabled)::before {
    opacity: 1;
}

.btn-submit:active:not(:disabled) {
    transform: scale(0.98);
}

.btn-submit:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.btn-submit i {
    font-size: 1rem;
    transition: transform var(--t-fast);
}

.btn-submit:hover:not(:disabled) i {
    transform: translateX(3px);
}

.alert {
    padding: 14px 18px;
    border-radius: var(--radius-sm);
    margin-top: 18px;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.88rem;
    animation: slideDown 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.alert-success {
    background: var(--success-bg);
    border: 1px solid rgba(46, 230, 168, 0.25);
    color: var(--success);
}

.alert-error {
    background: var(--error-bg);
    border: 1px solid rgba(255, 91, 110, 0.25);
    color: var(--error);
}

.alert i {
    font-size: 1.1rem;
    flex-shrink: 0;
}

.info-card {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.info-content {
    background: var(--surface);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    padding: 26px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    text-align: center;
    transition: all var(--t-base);
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
}

.info-content::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--accent-gradient);
    opacity: 0;
    transition: opacity var(--t-base);
}

.info-content:hover {
    border-color: var(--border-accent);
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.info-content:hover::before {
    opacity: 1;
}

.info-content i {
    font-size: 2rem;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 14px;
    display: inline-block;
}

.info-content h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text);
}

.info-content p {
    color: var(--text-2);
    font-size: 0.85rem;
    line-height: 1.6;
}

.share-box {
    display: flex;
    gap: 8px;
    margin-top: 14px;
}

.share-box input {
    flex: 1;
    padding: 10px 14px;
    background: var(--surface-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-xs);
    color: var(--text-2);
    font-size: 0.78rem;
    font-family: var(--font);
    outline: none;
    min-width: 0;
}

.share-box input:focus {
    border-color: var(--accent);
}

.btn-copy {
    padding: 10px 14px;
    background: var(--surface-2);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: var(--radius-xs);
    cursor: pointer;
    transition: all var(--t-base);
    font-size: 0.85rem;
    flex-shrink: 0;
}

.btn-copy:hover {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
}

.inbox-header {
    background: var(--surface);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-radius: var(--radius-lg);
    padding: 28px 32px;
    margin-bottom: 28px;
    border: 1px solid var(--border);
    transition: all var(--t-base);
    box-shadow: var(--shadow-md);
    margin-top: 40px;
}

.inbox-header:hover {
    border-color: var(--border-hover);
}

.inbox-header-content {
    display: flex;
    align-items: center;
    gap: 18px;
}

.inbox-header-content > i {
    font-size: 1.4rem;
    color: #fff;
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-gradient);
    border-radius: var(--radius-md);
    flex-shrink: 0;
    box-shadow: 0 4px 20px var(--accent-glow);
}

.inbox-header-content h1 {
    font-size: 1.7rem;
    font-weight: 700;
    letter-spacing: -0.5px;
    color: var(--text);
}

.inbox-header-content p {
    color: var(--text-2);
    font-size: 0.9rem;
}

.share-section {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}

.btn-share {
    padding: 9px 20px;
    background: var(--surface-2);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--t-base);
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
    font-weight: 500;
    font-family: var(--font);
}

.btn-share:hover {
    border-color: var(--accent);
    background: var(--accent-glow-soft);
    transform: translateY(-1px);
}

.share-message {
    color: var(--success);
    font-size: 0.85rem;
    font-weight: 500;
    animation: fadeIn 0.4s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: scale(0.9); }
    to { opacity: 1; transform: scale(1); }
}

.inbox-container {
    margin-bottom: 28px;
}

.messages-grid {
    display: grid;
    gap: 14px;
}

.message-envelope {
    background: var(--surface);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: var(--radius-md);
    padding: 20px 24px;
    border: 1px solid var(--border);
    display: flex;
    gap: 16px;
    align-items: flex-start;
    transition: all var(--t-base);
    position: relative;
    cursor: default;
    box-shadow: var(--shadow-sm);
    animation: envelopeIn 0.4s cubic-bezier(0.4, 0, 0.2, 1) backwards;
}

@keyframes envelopeIn {
    from {
        opacity: 0;
        transform: translateY(12px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.message-envelope:hover {
    border-color: var(--border-hover);
    transform: translateX(4px);
    box-shadow: var(--shadow-md);
}

.message-envelope.unread {
    border-left: 3px solid;
    border-image: var(--accent-gradient) 1;
    background: var(--surface-2);
}

.message-envelope.read {
    opacity: 0.65;
}

.message-envelope.read:hover {
    opacity: 1;
}

.envelope-icon {
    font-size: 1.4rem;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    position: relative;
    flex-shrink: 0;
    padding-top: 2px;
    width: 40px;
    text-align: center;
}

.unread-dot {
    position: absolute;
    top: 0;
    right: 2px;
    width: 8px;
    height: 8px;
    background: var(--accent-2);
    border-radius: 50%;
    box-shadow: 0 0 8px var(--accent-2);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.6; transform: scale(1.3); }
}

.envelope-content {
    flex: 1;
    min-width: 0;
}

.message-text {
    color: var(--text);
    font-size: 0.95rem;
    line-height: 1.7;
    word-wrap: break-word;
    margin-bottom: 10px;
}

.envelope-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.78rem;
    color: var(--text-3);
}

.envelope-footer i {
    margin-right: 4px;
    font-size: 0.7rem;
}

.message-status {
    display: flex;
    align-items: center;
    gap: 6px;
    font-weight: 500;
}

.message-status .fa-check-double {
    color: var(--success);
}

.message-status .fa-check {
    color: var(--accent);
}

.envelope-actions {
    display: flex;
    gap: 4px;
    flex-shrink: 0;
}

.btn-action {
    background: transparent;
    border: none;
    color: var(--text-3);
    cursor: pointer;
    padding: 8px 11px;
    border-radius: var(--radius-xs);
    transition: all var(--t-fast);
    font-size: 0.85rem;
}

.btn-action:hover {
    color: var(--text);
    background: var(--surface-hover);
}

.btn-action.delete:hover {
    color: var(--error);
    background: var(--error-bg);
}

.loading-state,
.empty-state,
.error-state {
    text-align: center;
    padding: 70px 20px;
    background: var(--surface);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
}

.loading-state i,
.empty-state i,
.error-state i {
    font-size: 2.8rem;
    margin-bottom: 18px;
    color: var(--text-3);
}

.loading-state i {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.empty-state i {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    opacity: 0.5;
}

.empty-state h3 {
    color: var(--text);
    font-weight: 600;
    margin-bottom: 6px;
    font-size: 1.1rem;
}

.empty-state p {
    color: var(--text-2);
    font-size: 0.9rem;
}

.error-state i {
    color: var(--error);
}

.error-state p {
    color: var(--text-2);
}

.share-promo-card {
    background: var(--surface);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-radius: var(--radius-lg);
    padding: 24px 28px;
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 18px;
    margin-bottom: 20px;
    transition: all var(--t-base);
    box-shadow: var(--shadow-sm);
}

.share-promo-card:hover {
    border-color: var(--border-hover);
    box-shadow: var(--shadow-md);
}

.share-promo-card > i {
    font-size: 1.6rem;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    flex-shrink: 0;
}

.share-promo-card h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 2px;
}

.share-promo-card p {
    color: var(--text-2);
    font-size: 0.85rem;
}

.share-link-box {
    display: flex;
    gap: 8px;
    margin-left: auto;
    flex-shrink: 0;
    max-width: 420px;
    width: 100%;
}

.share-link-box input {
    flex: 1;
    padding: 10px 14px;
    background: var(--surface-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-xs);
    color: var(--text-2);
    font-size: 0.78rem;
    font-family: var(--font);
    outline: none;
    transition: all var(--t-base);
    min-width: 0;
}

.share-link-box input:focus {
    border-color: var(--accent);
}

.btn-copy-link {
    padding: 10px 18px;
    background: var(--accent-gradient);
    color: #fff;
    border: none;
    border-radius: var(--radius-xs);
    cursor: pointer;
    font-size: 0.78rem;
    font-weight: 600;
    font-family: var(--font);
    transition: all var(--t-base);
    white-space: nowrap;
    box-shadow: 0 4px 12px var(--accent-glow);
}

.btn-copy-link:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px var(--accent-glow);
}

.cta-card {
    background: var(--surface);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-radius: var(--radius-lg);
    padding: 24px 28px;
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 18px;
    transition: all var(--t-base);
    box-shadow: var(--shadow-sm);
}

.cta-card:hover {
    border-color: var(--border-hover);
    box-shadow: var(--shadow-md);
}

.cta-card > i {
    font-size: 1.8rem;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    flex-shrink: 0;
}

.cta-card h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 2px;
}

.cta-card p {
    color: var(--text-2);
    font-size: 0.85rem;
}

.cta-card .btn-primary {
    margin-left: auto;
    padding: 11px 28px;
    background: var(--accent-gradient);
    color: #fff;
    border-radius: var(--radius-full);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.88rem;
    transition: all var(--t-base);
    white-space: nowrap;
    box-shadow: 0 4px 16px var(--accent-glow);
}

.cta-card .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px var(--accent-glow);
    color: #fff;
}

.auth-card {
    max-width: 440px;
    margin: 60px auto;
    background: var(--surface);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: var(--radius-xl);
    padding: 44px;
    border: 1px solid var(--border);
    transition: all var(--t-base);
    box-shadow: var(--shadow-lg);
    position: relative;
    overflow: hidden;
}

.auth-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--accent-gradient);
    box-shadow: 0 0 20px var(--accent-glow);
}

.auth-card:hover {
    border-color: var(--border-hover);
}

.auth-header {
    text-align: center;
    margin-bottom: 32px;
}

.auth-header i {
    font-size: 2.8rem;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 14px;
    display: inline-block;
    filter: drop-shadow(0 0 16px var(--accent-glow));
}

.auth-header h1 {
    font-size: 1.7rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    margin-bottom: 6px;
    background: linear-gradient(135deg, #fff 0%, #a8adc0 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.auth-header p {
    color: var(--text-2);
    font-size: 0.92rem;
}

.auth-footer {
    text-align: center;
    margin-top: 26px;
    padding-top: 22px;
    border-top: 1px solid var(--border);
    color: var(--text-2);
    font-size: 0.88rem;
}

.auth-footer p {
    margin-bottom: 4px;
}

.auth-footer a {
    color: var(--accent);
    text-decoration: none;
    font-weight: 600;
    transition: color var(--t-fast);
}

.auth-footer a:hover {
    color: var(--accent-2);
    text-decoration: underline;
}

.toggle-group {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 10px 0;
}

.toggle {
    position: relative;
    width: 48px;
    height: 28px;
    flex-shrink: 0;
    cursor: pointer;
}

.toggle input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--surface-input);
    border-radius: var(--radius-full);
    transition: all var(--t-base);
    border: 1.5px solid var(--border);
}

.toggle-slider::before {
    content: '';
    position: absolute;
    height: 20px;
    width: 20px;
    left: 3px;
    bottom: 3px;
    background: var(--text-3);
    border-radius: 50%;
    transition: all var(--t-base);
}

.toggle input:checked + .toggle-slider {
    background: var(--accent-gradient);
    border-color: transparent;
    box-shadow: 0 0 12px var(--accent-glow);
}

.toggle input:checked + .toggle-slider::before {
    transform: translateX(20px);
    background: #fff;
}

.toggle-label {
    color: var(--text-2);
    font-size: 0.88rem;
}

.settings-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    margin-top: 40px;
    padding-bottom: 60px;
}

@media (max-width: 1024px) {
    .send-wrapper {
        grid-template-columns: 1fr;
    }

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

    .settings-wrapper {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.2rem;
    }

    .hero-icon {
        font-size: 2.8rem;
    }

    .hero {
        padding: 48px 20px 32px;
    }

    .inbox-header-content {
        flex-wrap: wrap;
    }

    .inbox-header-content h1 {
        font-size: 1.3rem;
    }

    .share-section {
        margin-left: 0;
        width: 100%;
        justify-content: flex-start;
    }

    .share-promo-card {
        flex-direction: column;
        text-align: center;
        padding: 22px;
    }

    .share-link-box {
        margin-left: 0;
        max-width: 100%;
    }

    .cta-card {
        flex-direction: column;
        text-align: center;
        padding: 22px;
    }

    .cta-card .btn-primary {
        margin-left: 0;
    }

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

    .nav-menu {
        gap: 2px;
    }

    .nav-link {
        padding: 6px 10px;
        font-size: 0.78rem;
    }

    .nav-link span,
    .nav-link i + span {
        display: none;
    }

    .nav-link i {
        font-size: 0.95rem;
    }

    .nav-link-primary span {
        display: inline;
    }

    .nav-user {
        display: none;
    }

    .nav-link-primary {
        padding: 7px 14px;
    }

    .card {
        padding: 24px;
    }

    .auth-card {
        padding: 32px 24px;
        margin: 30px auto;
    }

    .message-envelope {
        flex-direction: column;
        padding: 18px;
    }

    .envelope-actions {
        width: 100%;
        justify-content: flex-end;
    }

    .container {
        padding: 0 16px;
    }

    .inbox-header {
        padding: 22px;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 1.8rem;
    }

    .hero {
        padding: 32px 16px 24px;
    }

    .hero-icon {
        font-size: 2.4rem;
    }

    .hero p {
        font-size: 1rem;
    }

    .card {
        padding: 18px;
        border-radius: var(--radius-md);
    }

    .auth-card {
        padding: 24px 18px;
        margin: 16px auto;
        border-radius: var(--radius-lg);
    }

    .inbox-header {
        padding: 18px;
        border-radius: var(--radius-md);
        margin-top: 24px;
    }

    .message-envelope {
        padding: 16px;
        border-radius: var(--radius-sm);
    }

    .envelope-icon {
        font-size: 1.2rem;
        width: 32px;
    }

    .message-text {
        font-size: 0.9rem;
    }

    .nav-brand {
        font-size: 1.1rem;
    }

    .nav-brand i {
        font-size: 1.2rem;
    }

    .nav-link {
        padding: 4px 8px;
        font-size: 0.72rem;
    }

    .share-link-box {
        flex-direction: column;
    }

    .btn-copy-link {
        width: 100%;
        justify-content: center;
        padding: 12px;
    }

    .btn-submit {
        padding: 13px;
        font-size: 0.9rem;
    }

    .settings-wrapper {
        margin-top: 24px;
    }
}