/* ===== CSS Reset & Base Styles ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #64748b;
    --background: #0f172a;
    --surface: #1e293b;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --border: #334155;
    --shadow: rgba(0, 0, 0, 0.3);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, var(--background) 0%, #1a1f35 100%);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* ===== Container ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1rem;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* ===== Header ===== */
.header {
    text-align: center;
    padding: 3rem 1rem 2rem;
}

.logo {
    margin-bottom: 1.5rem;
}

.logo-img {
    width: 80px;
    height: 80px;
    border-radius: 16px;
    box-shadow: 0 4px 12px var(--shadow);
}

.title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    letter-spacing: -0.02em;
}

.subtitle {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--text-secondary);
    font-weight: 400;
}

/* ===== Main Content ===== */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
    padding: 2rem 0;
}

/* ===== Features Section ===== */
.features-section {
    background: var(--surface);
    border-radius: 16px;
    padding: 2rem;
    max-width: 600px;
    width: 100%;
    box-shadow: 0 4px 6px var(--shadow);
    border: 1px solid var(--border);
}

.features-section h2 {
    font-size: 1.75rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    text-align: center;
}

.features-list {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 0.75rem;
}

.features-list li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 8px;
    transition: background-color 0.2s ease;
}

.features-list li:hover {
    background: rgba(255, 255, 255, 0.06);
}

.feature-icon {
    font-size: 1.25rem;
    flex-shrink: 0;
}

/* ===== Actions Section ===== */
.actions-section {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    width: 100%;
    max-width: 400px;
    padding: 0 1rem;
}

/* ===== Buttons ===== */
.btn {
    width: 100%;
    padding: 1.25rem 2rem;
    font-size: 1.1rem;
    font-weight: 600;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
    font-family: inherit;
}

.btn:focus {
    outline: 3px solid var(--primary-color);
    outline-offset: 2px;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.btn-primary:hover {
    background: var(--primary-hover);
    box-shadow: 0 6px 16px rgba(37, 99, 235, 0.4);
    transform: translateY(-2px);
}

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

.btn-secondary {
    background: transparent;
    color: var(--text-secondary);
    border: 2px solid var(--border);
}

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

.btn-text {
    font-size: 1.1rem;
}

.btn-subtitle {
    font-size: 0.85rem;
    opacity: 0.8;
    font-weight: 400;
}

/* ===== Status Message ===== */
.status-message {
    padding: 1rem;
    border-radius: 8px;
    text-align: center;
    font-weight: 500;
    display: none;
    max-width: 400px;
}

.status-message.success {
    display: block;
    background: rgba(34, 197, 94, 0.1);
    color: #4ade80;
    border: 1px solid rgba(34, 197, 94, 0.3);
}

.status-message.error {
    display: block;
    background: rgba(239, 68, 68, 0.1);
    color: #f87171;
    border: 1px solid rgba(239, 68, 68, 0.3);
}

/* ===== Footer ===== */
.footer {
    text-align: center;
    padding: 2rem 1rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* ===== Modal ===== */
.modal {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 1000;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.modal.active {
    display: flex;
}

.modal-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(8px);
}

.modal-content {
    position: relative;
    background: var(--surface);
    border-radius: 16px;
    padding: 2rem;
    max-width: 900px;
    width: 100%;
    max-height: 90vh;
    overflow: auto;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
    border: 1px solid var(--border);
}

.modal-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    width: 40px;
    height: 40px;
    border: none;
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    font-size: 2rem;
    line-height: 1;
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-close:hover {
    background: rgba(255, 255, 255, 0.2);
}

.modal-title {
    margin-bottom: 1rem;
    font-size: 1.5rem;
    padding-right: 3rem;
}

.screenshot-img {
    width: 100%;
    height: auto;
    border-radius: 8px;
    display: block;
}

/* ===== Responsive Design ===== */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }

    .header {
        padding: 2rem 1rem 1rem;
    }

    .features-list {
        grid-template-columns: 1fr;
    }

    .logo-img {
        width: 64px;
        height: 64px;
    }

    .modal-content {
        padding: 1.5rem;
    }
}

@media (max-width: 480px) {
    .title {
        font-size: 2rem;
    }

    .subtitle {
        font-size: 1rem;
    }

    .features-section {
        padding: 1.5rem;
    }

    .btn {
        padding: 1rem 1.5rem;
    }
}