:root {
    --kizilay-red: #E81F25;
    --kizilay-dark-red: #C4161C;
    --bg-color: #f8f9fc;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --card-bg: #ffffff;
    --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-red: 0 10px 25px -5px rgba(232, 31, 37, 0.3);
    --border-radius: 16px;
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    background-image: radial-gradient(circle at 50% 0%, rgba(232,31,37,0.05) 0%, transparent 70%);
}

.app-container {
    width: 100%;
    max-width: 480px; /* Mobile optimized max width */
    min-height: 100vh;
    padding: 2rem 1.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
}

/* Header */
.header {
    text-align: center;
    margin-bottom: 2.5rem;
    animation: fadeInDown 0.6s ease-out;
}

.logo-container {
    background: var(--card-bg);
    width: 90px;
    height: 90px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
    box-shadow: var(--shadow-md);
    padding: 10px;
}

.brand-name {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--kizilay-red);
    letter-spacing: -0.5px;
    margin-bottom: 0.25rem;
}

.subtitle {
    font-size: 0.95rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* Main Actions */
.main-actions {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 2.5rem;
}

.action-btn {
    width: 100%;
    padding: 1.25rem 1.5rem;
    border-radius: var(--border-radius);
    border: none;
    font-family: inherit;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    text-decoration: none;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-fast);
}

.btn-content {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.btn-content i {
    font-size: 1.3rem;
}

.action-btn:active {
    transform: scale(0.97);
}

.primary-btn {
    background-color: var(--kizilay-red);
    color: white;
    box-shadow: var(--shadow-red);
}

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

.secondary-btn {
    background-color: var(--card-bg);
    color: var(--text-primary);
    box-shadow: var(--shadow-sm);
    border: 1px solid rgba(0,0,0,0.05);
}

.secondary-btn .btn-content i {
    color: var(--kizilay-red);
}

.secondary-btn:hover {
    box-shadow: var(--shadow-md);
}

.chevron {
    font-size: 1rem;
    color: inherit;
    opacity: 0.8;
    transition: transform var(--transition-normal);
}

/* IBAN Section */
.iban-container {
    width: 100%;
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height 0.4s ease-out, opacity 0.3s ease-out, transform 0.3s ease-out;
    transform: translateY(-10px);
}

.iban-container.active {
    max-height: 500px;
    opacity: 1;
    transform: translateY(0);
    margin-top: 0.5rem;
}

.rotate-180 {
    transform: rotate(180deg);
}

.iban-card {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 1.25rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid rgba(0,0,0,0.05);
    margin-bottom: 1rem;
}

.bank-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid #f1f5f9;
}

.bank-logo {
    height: 24px;
    width: auto;
}

.bank-name {
    font-weight: 600;
    color: var(--text-primary);
}

.iban-details {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.iban-number {
    font-family: monospace;
    font-size: 1.05rem;
    color: var(--text-primary);
    background: #f8fafc;
    padding: 0.75rem;
    border-radius: 8px;
    word-break: break-all;
    text-align: center;
    letter-spacing: 1px;
}

.copy-btn {
    background: rgba(232, 31, 37, 0.1);
    color: var(--kizilay-red);
    border: none;
    padding: 0.75rem;
    border-radius: 8px;
    font-weight: 600;
    font-family: inherit;
    font-size: 0.95rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: background-color var(--transition-fast);
}

.copy-btn:active {
    background: rgba(232, 31, 37, 0.2);
    transform: scale(0.98);
}

.info-text {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.5;
    background: #e0f2fe;
    color: #0369a1;
    padding: 1rem;
    border-radius: 12px;
    display: flex;
    gap: 0.75rem;
    align-items: flex-start;
}

.info-text i {
    margin-top: 0.15rem;
}

/* Footer / Socials */
.social-footer {
    margin-top: auto;
    width: 100%;
    text-align: center;
}

.social-title {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 600;
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.social-grid {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 2rem;
}

.social-icon {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--card-bg);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    text-decoration: none;
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-fast), color var(--transition-fast);
}

.social-icon:active {
    transform: scale(0.9);
}

.social-icon:hover {
    color: var(--kizilay-red);
    box-shadow: var(--shadow-md);
}

.copyright {
    font-size: 0.8rem;
    color: #94a3b8;
}

/* Toast */
.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: #10b981;
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 50px;
    font-weight: 600;
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    box-shadow: 0 10px 15px -3px rgba(16, 185, 129, 0.3);
    opacity: 0;
    transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275), opacity 0.3s;
    z-index: 1000;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

/* Animations */
@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}