:root {
    /* Light Theme Tokens */
    --color-primary: #00a884;
    --color-primary-hover: #008f6f;
    --color-background: #f0f2f5;
    --color-surface: #ffffff;
    --color-surface-hover: #f5f6f6;
    --color-text: #111b21;
    --color-text-secondary: #667781;
    --color-border: #e9edef;
    --color-error: #ea0038;
    --color-success: #00a884;
    --color-background-rgb: 240, 242, 245;
    --color-primary-rgb: 0, 168, 132;
    --color-text-rgb: 17, 27, 33;
    --color-text-secondary-rgb: 102, 119, 129;
    --shadow-card: 0 17px 50px 0 rgba(11,20,26,.19), 0 12px 15px 0 rgba(11,20,26,.24);
    --border-radius: 8px;
    --border-radius-input: 6px;
    --transition-speed: 0.3s;
}

[data-theme="dark"] {
    /* Dark Theme Tokens */
    --color-primary: #00a884;
    --color-primary-hover: #008f6f;
    --color-background: #111b21;
    --color-surface: #222e35;
    --color-surface-hover: #2a3942;
    --color-text: #e9edef;
    --color-text-secondary: #8696a0;
    --color-border: #364147;
    --color-error: #ef5350;
    --color-success: #00a884;
    --color-background-rgb: 17, 27, 33;
    --color-primary-rgb: 0, 168, 132;
    --shadow-card: 0 17px 50px 0 rgba(0,0,0,.19), 0 12px 15px 0 rgba(0,0,0,.24);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
}

body {
    background-color: var(--color-background);
    color: var(--color-text);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: background-color var(--transition-speed) ease;
    overflow-x: hidden;
}

.top-band {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 222px;
    background-color: var(--color-primary);
    z-index: 1;
}

[data-theme="dark"] .top-band {
    background-color: #005c4b; /* Darker green for dark mode band */
}

/* Theme Toggle */
.theme-toggle {
    position: absolute;
    top: 20px;
    right: 20px;
    z-index: 10;
    cursor: pointer;
    background-color: rgba(255, 255, 255, 0.2);
    padding: 10px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    color: white;
    transition: transform 0.2s;
    backdrop-filter: blur(5px);
}

.theme-toggle:hover {
    transform: scale(1.1);
}

/* App Container */
.app-container {
    position: relative;
    z-index: 2;
    width: 100%;
    max-width: 1000px;
    padding: 20px;
    animation: slideUpFade 0.6s ease forwards;
}

.login-card {
    background-color: var(--color-surface);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-card);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    min-height: 500px;
    transition: background-color var(--transition-speed);
}

@media (min-width: 768px) {
    .login-card {
        flex-direction: row;
    }
}

/* Brand Section */
.brand-section {
    flex: 1;
    background: linear-gradient(135deg, var(--color-surface) 0%, var(--color-surface-hover) 100%);
    padding: 40px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    border-bottom: 1px solid var(--color-border);
}

@media (min-width: 768px) {
    .brand-section {
        border-bottom: none;
        border-right: 1px solid var(--color-border);
    }
}

.logo {
    width: 80px;
    height: 80px;
    background-color: var(--color-primary);
    color: white;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 24px;
    box-shadow: 0 4px 12px rgba(0, 168, 132, 0.4);
}

.logo svg {
    width: 40px;
    height: 40px;
}

.brand-section h1 {
    font-size: 28px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--color-text);
}

.brand-section p {
    color: var(--color-text-secondary);
    font-size: 16px;
    line-height: 1.5;
    max-width: 300px;
}

/* Form Section */
.form-section {
    flex: 1.2;
    padding: 40px;
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.form-container {
    width: 100%;
    max-width: 360px;
    display: flex;
    flex-direction: column;
    align-items: center;
    opacity: 0;
    visibility: hidden;
    position: absolute;
    transform: translateX(50px);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.form-container.active {
    opacity: 1;
    visibility: visible;
    position: relative;
    transform: translateX(0);
}

.form-container.exit {
    transform: translateX(-50px);
}

.form-container h2 {
    font-size: 24px;
    font-weight: 500;
    margin-bottom: 10px;
    color: var(--color-text);
    width: 100%;
    text-align: left;
}

.subtitle {
    color: var(--color-text-secondary);
    font-size: 14px;
    margin-bottom: 30px;
    width: 100%;
    text-align: left;
    line-height: 1.4;
}

.highlight-text {
    font-weight: 600;
    color: var(--color-text);
}

.login-form {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
    width: 100%;
}

.input-group label {
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text);
}

.input-wrapper {
    display: flex;
    align-items: center;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-input);
    overflow: hidden;
    background-color: var(--color-background);
    transition: border-color 0.2s, box-shadow 0.2s;
}

.input-wrapper:focus-within {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 2px rgba(0, 168, 132, 0.2);
}

.country-code {
    padding: 12px 16px;
    color: var(--color-text);
    font-weight: 500;
    border-right: 1px solid var(--color-border);
    user-select: none;
}

input[type="number"], input[type="text"] {
    flex: 1;
    padding: 12px 16px;
    border: none;
    background: transparent;
    color: var(--color-text);
    font-size: 16px;
    outline: none;
}

input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

/* OTP Inputs */
.otp-inputs {
    display: flex;
    gap: 10px;
    justify-content: space-between;
}

.otp-box {
    width: 48px;
    height: 56px;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-input);
    text-align: center;
    font-size: 24px;
    font-weight: 600;
    background-color: var(--color-background);
    color: var(--color-text);
    transition: all 0.2s;
}

.otp-box:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 2px rgba(0, 168, 132, 0.2);
    background-color: var(--color-surface);
}

.error-message {
    color: var(--color-error);
    font-size: 13px;
    min-height: 18px;
    text-align: left;
    margin-top: 4px;
    opacity: 0;
    transition: opacity 0.2s;
}

.error-message.visible {
    opacity: 1;
}

/* Buttons */
.btn-primary {
    background-color: var(--color-primary);
    color: white;
    border: none;
    border-radius: var(--border-radius-input);
    padding: 14px 20px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s, transform 0.1s;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    width: 100%;
    margin-top: 10px;
}

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

.btn-primary:active {
    transform: translateY(1px);
}

.btn-primary:disabled {
    background-color: var(--color-border);
    color: var(--color-text-secondary);
    cursor: default;
    transform: none;
}

.back-link {
    margin-top: 24px;
    text-align: center;
    width: 100%;
}

.back-link a {
    color: var(--color-primary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: color 0.2s;
}

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

/* Success State */
.success-icon {
    color: var(--color-success);
    margin-bottom: 20px;
    display: flex;
    justify-content: center;
    width: 100%;
}

.success-icon svg {
    width: 64px;
    height: 64px;
}

#successContainer {
    text-align: center;
}

#successContainer h2 {
    text-align: center;
}

/* Loaders */
.loader {
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 1s ease-in-out infinite;
    position: absolute;
    display: none;
}

.btn-primary.loading .btn-text {
    visibility: hidden;
}

.btn-primary.loading .loader {
    display: block;
}

/* API Config */
.api-config {
    margin-top: 20px;
    background-color: var(--color-surface);
    padding: 15px;
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    gap: 10px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.api-config input {
    background-color: var(--color-background);
    border: 1px solid var(--color-border);
    padding: 8px 12px;
    border-radius: 4px;
    color: var(--color-text);
    width: 250px;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

@keyframes slideUpFade {
    0% { transform: translateY(30px); opacity: 0; }
    100% { transform: translateY(0); opacity: 1; }
}

/* ============================================================
   MOBILE RESPONSIVE — Login Page
   ============================================================ */
@media (max-width: 768px) {
    body {
        align-items: flex-start;
        padding-top: 40px;
    }

    .top-band {
        height: 160px;
    }

    .app-container {
        padding: 10px;
    }

    .login-card {
        min-height: auto;
        border-radius: 12px;
    }

    .brand-section {
        padding: 30px 20px;
    }

    .brand-section h1 {
        font-size: 24px;
    }

    .brand-section p {
        font-size: 14px;
        max-width: 100%;
    }

    .logo {
        width: 64px;
        height: 64px;
        margin-bottom: 16px;
    }

    .logo svg {
        width: 32px;
        height: 32px;
    }

    .form-section {
        padding: 30px 20px;
    }

    .form-container h2 {
        font-size: 20px;
        text-align: center;
    }

    .subtitle {
        text-align: center;
        margin-bottom: 20px;
    }

    .otp-inputs {
        gap: 6px;
    }

    .otp-box {
        width: 42px;
        height: 50px;
        font-size: 20px;
    }

    .api-config {
        flex-direction: column;
        align-items: stretch;
        font-size: 12px;
        padding: 10px;
    }

    .api-config input {
        width: 100%;
    }

    .theme-toggle {
        top: 10px;
        right: 10px;
        padding: 8px;
    }
}

/* For very small devices */
@media (max-width: 360px) {
    .otp-box {
        width: 38px;
        height: 46px;
    }
    
    .brand-section {
        padding: 20px 15px;
    }
    
    .form-section {
        padding: 20px 15px;
    }
}