:root {
    /* Light theme colors */
    --bg-primary: #ffffff;
    --bg-secondary: #faf5f5;
    --text-primary: #1a1a1a;
    --text-secondary: #4a4a4a;
    --accent-primary: #800020;
    --accent-primary-rgb: 128, 0, 32;
    --accent-secondary: #a0153e;
    --accent-hover: #600018;
    --border-color: #e8d5d8;
    --header-bg: rgba(255, 255, 255, 0.95);
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    
    /* Animation variables */
    --transition-speed: 0.3s;
    
    /* Typography */
    --letter-spacing-body: 0.02em;
    --letter-spacing-headings: 0.01em;

    /* Layout */
    --header-height: 60px;
    --container-padding: 1rem;
    --max-width: 1200px;
}

[data-theme="dark"] {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2a1a1d;
    --text-primary: #ffffff;
    --text-secondary: #c4a5ab;
    --accent-primary: #a0153e;
    --accent-primary-rgb: 160, 21, 62;
    --accent-secondary: #c41e3a;
    --accent-hover: #c41e3a;
    --border-color: #3a2428;
    --header-bg: rgba(26, 26, 26, 0.95);
}

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

/* Base styles */
html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Source Code Pro', monospace;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    letter-spacing: var(--letter-spacing-body);
    transition: background-color var(--transition-speed), color var(--transition-speed);
    overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4 {
    font-family: 'Dela Gothic One', cursive;
    line-height: 1.2;
    letter-spacing: var(--letter-spacing-headings);
    font-weight: normal;
    margin-bottom: 1rem;
}

h1 { font-size: clamp(2rem, 5vw, 3rem); }
h2 { font-size: clamp(1.5rem, 4vw, 2.5rem); }
h3 { font-size: clamp(1.25rem, 3vw, 2rem); }
h4 { font-size: clamp(1rem, 2vw, 1.5rem); }

p { margin-bottom: 1rem; }

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: var(--header-bg);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: background-color var(--transition-speed);
}

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

/* Logo */
.logo {
    font-family: 'Dela Gothic One', cursive;
    font-size: 1.25rem;
    color: var(--text-primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    letter-spacing: var(--letter-spacing-headings);
    font-weight: normal;
    transition: opacity var(--transition-speed);
}

.logo:hover {
    opacity: 0.9;
}

.logo-img {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    object-fit: cover;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

/* Navigation */
.nav-links {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    letter-spacing: var(--letter-spacing-body);
    transition: color var(--transition-speed);
    position: relative;
    padding: 0.5rem 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--accent-primary);
    transition: width var(--transition-speed);
}

.nav-link:hover {
    color: var(--accent-primary);
}

.nav-link:hover::after {
    width: 100%;
}

/* CTA Button in Nav */
.nav-link-cta {
    background: var(--accent-primary);
    color: white !important;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    box-shadow: 0 2px 8px rgba(var(--accent-primary-rgb), 0.3);
    transition: all var(--transition-speed);
}

.nav-link-cta::after {
    display: none;
}

.nav-link-cta:hover {
    background: var(--accent-secondary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(var(--accent-primary-rgb), 0.4);
}

.nav-link-cta i {
    font-size: 0.9rem;
}

/* Theme Toggle */
.theme-toggle {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.5rem;
    font-size: 1.2rem;
    transition: color var(--transition-speed);
}

.theme-toggle:hover {
    color: var(--accent-primary);
}

/* Mobile Menu Button */
.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
}

/* Main Content */
.main-content {
    margin-top: var(--header-height);
    min-height: calc(100vh - var(--header-height));
    padding: calc(var(--container-padding) * 2);
    max-width: var(--max-width);
    margin-left: auto;
    margin-right: auto;
}

/* Footer */
.footer {
    background-color: var(--bg-secondary);
    padding: calc(var(--container-padding) * 3) var(--container-padding);
    margin-top: 4rem;
    transition: background-color var(--transition-speed);
}

.footer-content {
    max-width: var(--max-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.footer-section h3 {
    color: var(--text-primary);
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.footer-links {
    list-style: none;
    letter-spacing: var(--letter-spacing-body);
}

.footer-links li {
    margin-bottom: 0.5rem;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition-speed);
}

.footer-links a:hover {
    color: var(--accent-primary);
}

.social-links {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
}

.social-links a {
    color: var(--text-secondary);
    font-size: 1.5rem;
    transition: color var(--transition-speed);
}

.social-links a:hover {
    color: var(--accent-primary);
}

/* Responsive Design */
@media (max-width: 1024px) {
    :root {
        --container-padding: 1.5rem;
    }
}

@media (max-width: 768px) {
    :root {
        --header-height: 60px;
        --container-padding: 1rem;
    }

    .mobile-menu-btn {
        display: block;
        order: 1;
    }

    .nav-links {
        display: none;
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        background: var(--bg-primary);
        padding: 1rem;
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        border-bottom: 1px solid var(--border-color);
    }

    .nav-links.active {
        display: flex;
    }

    .nav-link {
        padding: 1rem;
        text-align: center;
        border-bottom: 1px solid var(--border-color);
    }

    .nav-link:last-child {
        border-bottom: none;
    }

    .nav-link::after {
        display: none;
    }

    .nav-link-cta {
        margin: 0.5rem;
        justify-content: center;
        border-bottom: none;
    }

    .theme-toggle {
        width: 100%;
        padding: 1rem;
        font-size: 1rem;
        border-bottom: 1px solid var(--border-color);
    }

    .main-content {
        padding: var(--container-padding);
    }

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .social-links {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    html {
        font-size: 14px;
    }

    .logo {
        font-size: 1.1rem;
        gap: 0.5rem;
    }

    .logo-img {
        width: 28px;
        height: 28px;
    }

    .footer {
        padding: calc(var(--container-padding) * 2) var(--container-padding);
    }
}

/* Utility Classes */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

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

.mt-1 { margin-top: 1rem; }
.mt-2 { margin-top: 2rem; }
.mt-3 { margin-top: 3rem; }
.mb-1 { margin-bottom: 1rem; }
.mb-2 { margin-bottom: 2rem; }
.mb-3 { margin-bottom: 3rem; }

/* ============================================================
   EMAIL GENERATOR SECTION
   ============================================================ */

.email-generator-section {
    background: var(--bg-secondary);
    padding: 4rem 2rem;
    margin-top: 2rem;
}

.email-generator-container {
    max-width: 800px;
    margin: 0 auto;
    background: var(--bg-primary);
    border-radius: 20px;
    padding: 3rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

.email-generator-title {
    text-align: center;
    font-size: 2rem;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.email-generator-subtitle {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    font-size: 1.1rem;
}

.generator-button {
    width: 100%;
    padding: 1.25rem 2rem;
    background: var(--accent-primary);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-speed);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    font-family: 'Source Code Pro', monospace;
}

.generator-button:hover:not(:disabled) {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(var(--accent-primary-rgb), 0.3);
}

.generator-button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.generator-divider {
    text-align: center;
    margin: 2rem 0;
    position: relative;
}

.generator-divider::before,
.generator-divider::after {
    content: '';
    position: absolute;
    top: 50%;
    width: 40%;
    height: 1px;
    background: var(--border-color);
}

.generator-divider::before {
    left: 0;
}

.generator-divider::after {
    right: 0;
}

.generator-divider span {
    background: var(--bg-primary);
    padding: 0 1rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.custom-email-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-top: 2rem;
}

.custom-email-title {
    text-align: center;
    font-size: 1.25rem;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.form-row {
    display: flex;
    gap: 1rem;
}

.form-input {
    flex: 1;
    padding: 1rem;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    font-size: 1rem;
    font-family: 'Source Code Pro', monospace;
    background: var(--bg-secondary);
    color: var(--text-primary);
    transition: all var(--transition-speed);
}

.form-input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(var(--accent-primary-rgb), 0.1);
}

.form-select {
    padding: 1rem;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    font-size: 1rem;
    font-family: 'Source Code Pro', monospace;
    background: var(--bg-secondary);
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition-speed);
    min-width: 200px;
}

.form-select:focus {
    outline: none;
    border-color: var(--accent-primary);
}

.notification {
    padding: 1rem;
    border-radius: 12px;
    margin-bottom: 1rem;
    display: none;
    align-items: center;
    gap: 0.75rem;
    animation: slideDown 0.3s ease;
}

.notification.success {
    background: #d1fae5;
    border: 1px solid #6ee7b7;
    color: #065f46;
}

.notification.error {
    background: #fee2e2;
    border: 1px solid #fca5a5;
    color: #991b1b;
}

.notification.warning {
    background: #fef3c7;
    border: 1px solid #fcd34d;
    color: #92400e;
}

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

.email-result {
    margin-top: 2rem;
    padding: 2rem;
    background: var(--bg-secondary);
    border-radius: 16px;
    border: 2px solid var(--accent-primary);
    display: none;
}

.result-label {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.result-email-container {
    display: flex;
    align-items: center;
    gap: 1rem;
    background: var(--bg-primary);
    padding: 1.25rem;
    border-radius: 12px;
}

.result-email {
    flex: 1;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--accent-primary);
    word-break: break-all;
    font-family: 'Source Code Pro', monospace;
}

.copy-button {
    padding: 0.75rem 1rem;
    background: var(--accent-primary);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all var(--transition-speed);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    white-space: nowrap;
}

.copy-button:hover {
    background: var(--accent-hover);
    transform: scale(1.05);
}

.copy-button.copied {
    background: var(--success-color);
}

/* ============================================================
   INBOX SECTION
   ============================================================ */

.inbox-section {
    padding: 4rem 2rem;
}

.inbox-container {
    max-width: 900px;
    margin: 0 auto;
    background: var(--bg-primary);
    border-radius: 20px;
    padding: 2rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

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

.inbox-title {
    font-size: 1.5rem;
    color: var(--text-primary);
}

.inbox-status {
    color: var(--text-secondary);
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.refresh-button {
    padding: 0.75rem 1.5rem;
    background: var(--accent-primary);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all var(--transition-speed);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-family: 'Source Code Pro', monospace;
    font-weight: 500;
}

.refresh-button:hover:not(:disabled) {
    background: var(--accent-hover);
    transform: translateY(-2px);
}

.refresh-button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.inbox-content {
    min-height: 200px;
}

.inbox-empty {
    text-align: center;
    padding: 3rem 2rem;
    color: var(--text-secondary);
}

.inbox-empty-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

.email-message {
    background: var(--bg-secondary);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1rem;
    border-left: 4px solid var(--accent-primary);
    transition: all var(--transition-speed);
    cursor: pointer;
}

.email-message:hover {
    transform: translateX(5px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.email-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: 0.75rem;
}

.email-subject {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.email-time {
    color: var(--text-secondary);
    font-size: 0.85rem;
    white-space: nowrap;
}

.email-sender {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.email-preview {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.5;
    margin-bottom: 1rem;
}

.view-button {
    padding: 0.5rem 1rem;
    background: var(--accent-primary);
    color: white !important;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all var(--transition-speed);
    font-size: 0.9rem;
    font-family: 'Source Code Pro', monospace;
    text-decoration: none;
    display: inline-block;
}

.view-button:hover {
    background: var(--accent-hover);
    color: white !important;
}

/* ============================================================
   HOW IT WORKS SECTION
   ============================================================ */

.how-it-works-section {
    padding: 4rem 2rem;
    background: var(--bg-primary);
}

.how-it-works-container {
    max-width: 1000px;
    margin: 0 auto;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    color: var(--text-primary);
    margin-bottom: 3rem;
}

.steps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.step-card {
    background: var(--bg-secondary);
    border-radius: 16px;
    padding: 2rem;
    text-align: center;
    transition: transform var(--transition-speed);
}

.step-card:hover {
    transform: translateY(-5px);
}

.step-number {
    width: 60px;
    height: 60px;
    background: var(--accent-primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0 auto 1.5rem;
}

.step-title {
    font-size: 1.25rem;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

.step-description {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ============================================================
   FEATURES SECTION
   ============================================================ */

.features-section {
    padding: 4rem 2rem;
    background: var(--bg-secondary);
}

.features-container {
    max-width: 1200px;
    margin: 0 auto;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: var(--bg-primary);
    border-radius: 16px;
    padding: 2rem;
    transition: all var(--transition-speed);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
}

.feature-icon {
    font-size: 2.5rem;
    color: var(--accent-primary);
    margin-bottom: 1rem;
}

.feature-title {
    font-size: 1.25rem;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

.feature-description {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ============================================================
   RESPONSIVE DESIGN
   ============================================================ */

@media (max-width: 768px) {
    .email-generator-container {
        padding: 2rem 1.5rem;
    }

    .form-row {
        flex-direction: column;
    }

    .result-email-container {
        flex-direction: column;
        text-align: center;
    }

    .copy-button {
        width: 100%;
        justify-content: center;
    }

    .inbox-header {
        flex-direction: column;
        gap: 1rem;
        align-items: stretch;
    }

    .refresh-button {
        width: 100%;
        justify-content: center;
    }

    .email-header {
        flex-direction: column;
        gap: 0.5rem;
    }

    .modal-content {
        margin: 1rem;
    }

    .modal-header,
    .modal-body {
        padding: 1.5rem;
    }

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

@media (max-width: 480px) {
    .email-generator-section,
    .inbox-section,
    .how-it-works-section,
    .features-section {
        padding: 2rem 1rem;
    }

    .email-generator-title,
    .section-title {
        font-size: 1.75rem;
    }

    .result-email {
        font-size: 1rem;
    }
}