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

/*=============== VARIABLES CSS ===============*/
:root {
    /*========== Modern Indigo/Purple Color Palette (Matching Dashboard) ==========*/
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --primary-lighter: #c7d2fe;
    
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-gradient-start: #0f172a;
    --bg-gradient-end: #1e293b;
    --bg-accent: #312e81;
    
    --card-bg: rgba(255, 255, 255, 0.98);
    --card-border: rgba(99, 102, 241, 0.2);
    --card-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    --card-shadow-hover: 0 25px 70px rgba(99, 102, 241, 0.4);
    
    --input-bg: rgba(255, 255, 255, 1);
    --input-border: rgba(226, 232, 240, 0.8);
    --input-border-focus: var(--primary);
    --input-text: #0f172a;
    --input-placeholder: #94a3b8;
    
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-light: #ffffff;
    --text-muted: #64748b;
    
    --button-bg: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    --button-bg-hover: linear-gradient(135deg, var(--primary-light) 0%, var(--primary) 100%);
    --button-text: #ffffff;
    --button-shadow: 0 4px 14px rgba(99, 102, 241, 0.4);
    --button-shadow-hover: 0 6px 20px rgba(99, 102, 241, 0.5);
    
    --toggle-bg: rgba(255, 255, 255, 0.15);
    --toggle-bg-active: #ffffff;
    --toggle-border: rgba(255, 255, 255, 0.25);
    --toggle-text: rgba(255, 255, 255, 0.9);
    --toggle-text-active: var(--primary);
    
    --back-button-bg: rgba(255, 255, 255, 0.12);
    --back-button-bg-hover: rgba(255, 255, 255, 0.2);
    --back-button-border: rgba(255, 255, 255, 0.25);
    --back-button-text: #ffffff;
    
    /*========== Font and typography ==========*/
    --body-font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Arial, sans-serif;
    --h1-font-size: 2rem;
    --h1-font-size-mobile: 1.75rem;
    --normal-font-size: 1rem;
    --small-font-size: 0.875rem;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --font-weight-extrabold: 800;
    
    /*========== Spacing ==========*/
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 2.5rem;
    --spacing-3xl: 3rem;
    
    /*========== Border radius ==========*/
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-2xl: 24px;
    --radius-full: 9999px;
    
    /*========== Transitions ==========*/
    --transition-fast: all 0.15s ease;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    
    /*========== Shadows ==========*/
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
}

/*=============== BASE ===============*/
*,
*::before,
*::after {
    box-sizing: border-box;
    padding: 0;
    margin: 0;
}

html {
    height: 100%;
    scroll-behavior: smooth;
}

body {
    height: 100%;
    width: 100%;
    overflow-x: hidden;
    font-family: var(--body-font);
    font-size: var(--normal-font-size);
    font-weight: var(--font-weight-normal);
    line-height: 1.6;
    color: var(--text-light);
    background: linear-gradient(135deg, var(--bg-gradient-start) 0%, var(--bg-secondary) 50%, var(--bg-accent) 100%);
    background-attachment: fixed;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

input,
button {
    font-family: inherit;
    font-size: inherit;
}

a {
    text-decoration: none;
    color: inherit;
}

img {
    display: block;
    max-width: 100%;
    height: auto;
}

/*=============== LOGIN CONTAINER ===============*/
.login {
    position: relative;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl) var(--spacing-md);
    overflow: hidden;
}

/* Background image overlay */
.login__bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    z-index: -1;
    opacity: 0.1;
    filter: blur(3px);
}

/* Gradient overlay for better contrast */
.login::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--bg-gradient-start) 0%, var(--bg-secondary) 50%, var(--bg-accent) 100%);
    z-index: -1;
}

/*=============== BACK TO HOME LINK ===============*/
.back-to-home {
    position: absolute;
    top: var(--spacing-xl);
    left: var(--spacing-xl);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--back-button-text);
    font-size: var(--normal-font-size);
    font-weight: var(--font-weight-semibold);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--back-button-bg);
    border: 1px solid var(--back-button-border);
    border-radius: var(--radius-full);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: var(--transition);
    z-index: 100;
    cursor: pointer;
    box-shadow: var(--shadow-md);
}

.back-to-home:hover,
.back-to-home:focus {
    background: var(--back-button-bg-hover);
    border-color: rgba(255, 255, 255, 0.4);
    transform: translateX(-2px);
    outline: none;
    box-shadow: var(--shadow-lg);
}

.back-to-home i {
    font-size: 1.25rem;
    display: flex;
    align-items: center;
}

/*=============== AUTH TOGGLE ===============*/
.auth-toggle {
    position: relative;
    display: inline-flex;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-2xl);
    padding: var(--spacing-xs);
    background: var(--toggle-bg);
    border: 1px solid var(--toggle-border);
    border-radius: var(--radius-full);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    z-index: 10;
    box-shadow: var(--shadow-lg);
}

.toggle-btn {
    padding: var(--spacing-sm) var(--spacing-xl);
    border: none;
    background: transparent;
    color: var(--toggle-text);
    font-size: var(--normal-font-size);
    font-weight: var(--font-weight-semibold);
    font-family: var(--body-font);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: var(--transition);
    outline: none;
    white-space: nowrap;
}

.toggle-btn:hover {
    color: var(--text-light);
    transform: scale(1.05);
}

.toggle-btn:focus {
    outline: 2px solid rgba(255, 255, 255, 0.5);
    outline-offset: 2px;
}

.toggle-btn.active {
    background: var(--toggle-bg-active);
    color: var(--toggle-text-active);
    font-weight: var(--font-weight-bold);
    box-shadow: var(--shadow-lg);
    transform: scale(1.05);
}

/*=============== FORM CONTAINER ===============*/
.login__form-container {
    position: relative;
    width: 100%;
    max-width: 480px;
    min-height: 400px;
}

/*=============== FORM ===============*/
.login__form {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    padding: var(--spacing-3xl) var(--spacing-2xl);
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-2xl);
    box-shadow: var(--card-shadow);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    transition: var(--transition-slow);
    opacity: 0;
    transform: translateY(20px) scale(0.98);
    pointer-events: none;
    visibility: hidden;
}

.login__form.active {
    opacity: 1;
    transform: translateY(0) scale(1);
    pointer-events: all;
    visibility: visible;
    position: relative;
}

.login__title {
    text-align: center;
    font-size: var(--h1-font-size);
    font-weight: var(--font-weight-extrabold);
    color: var(--text-primary);
    margin-bottom: var(--spacing-2xl);
    letter-spacing: -0.02em;
    line-height: 1.2;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/*=============== INPUTS ===============*/
.login__inputs {
    display: grid;
    row-gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.login__box {
    position: relative;
    display: grid;
    grid-template-columns: 1fr auto;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 0 var(--spacing-lg);
    background: var(--input-bg);
    border: 2px solid var(--input-border);
    border-radius: var(--radius-full);
    transition: var(--transition);
}

.login__box:hover {
    border-color: var(--primary-lighter);
    box-shadow: var(--shadow-sm);
    transform: translateY(-1px);
}

.login__box:focus-within {
    border-color: var(--input-border-focus);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
    outline: none;
    transform: translateY(-2px);
}

.login__input {
    width: 100%;
    padding: var(--spacing-md) 0;
    background: transparent;
    border: none;
    outline: none;
    color: var(--input-text);
    font-size: var(--normal-font-size);
    font-weight: var(--font-weight-medium);
    font-family: var(--body-font);
    line-height: 1.5;
}

.login__input::placeholder {
    color: var(--input-placeholder);
    font-weight: var(--font-weight-normal);
}

.login__input:focus {
    outline: none;
}

.login__box i {
    font-size: 1.25rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    cursor: default;
}

.login__box:focus-within i:not(.eye-icon) {
    color: var(--primary);
    transform: scale(1.1);
}

/* Keep eye-icon color unchanged when input is focused */
.login__box:focus-within .eye-icon,
.login__box:focus-within .eye-icon i {
    color: var(--text-muted);
}

.eye-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    padding: 0;
    cursor: pointer;
    color: var(--text-muted);
    transition: var(--transition);
    font-size: 1.25rem;
    width: auto;
    height: auto;
}

.eye-icon i {
    display: flex;
    align-items: center;
    justify-content: center;
}

.eye-icon:hover {
    color: var(--primary);
    background: transparent;
    transform: scale(1.1);
}

.eye-icon:focus {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
    border-radius: 4px;
    background: transparent;
}

.eye-icon:active {
    background: transparent;
}

/*=============== BUTTON ===============*/
.login__button {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-xl);
    margin-top: var(--spacing-md);
    background: var(--button-bg);
    border: none;
    border-radius: var(--radius-full);
    color: var(--button-text);
    font-size: var(--normal-font-size);
    font-weight: var(--font-weight-bold);
    font-family: var(--body-font);
    cursor: pointer;
    box-shadow: var(--button-shadow);
    transition: var(--transition);
    outline: none;
    position: relative;
    overflow: hidden;
}

.login__button::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.login__button:hover {
    background: var(--button-bg-hover);
    box-shadow: var(--button-shadow-hover);
    transform: translateY(-2px);
}

.login__button:hover::before {
    width: 300px;
    height: 300px;
}

.login__button:active {
    transform: translateY(0);
    box-shadow: var(--button-shadow);
}

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

/*=============== SIGNUP FORM ADJUSTMENTS ===============*/
.signup-form .login__inputs {
    row-gap: var(--spacing-md);
}

/*=============== ERROR MESSAGES ===============*/
.error-message {
    color: #ef4444;
    font-size: var(--small-font-size);
    margin-top: var(--spacing-xs);
    padding-left: var(--spacing-lg);
    display: none;
    font-weight: var(--font-weight-semibold);
}

.login__box.error {
    border-color: #ef4444;
}

.login__box.error:focus-within {
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

.login__box.error ~ .error-message {
    display: block;
}

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

/* Medium devices (tablets) */
@media screen and (min-width: 576px) {
    .login__form {
        padding: var(--spacing-3xl) var(--spacing-2xl);
    }
    
    .login__form-container {
        min-height: 500px;
    }
    
    .auth-toggle {
        margin-bottom: var(--spacing-3xl);
    }
}

/* Large devices (desktops) */
@media screen and (min-width: 768px) {
    .login__form {
        padding: var(--spacing-3xl) var(--spacing-3xl);
    }
    
    .login__form-container {
        max-width: 520px;
    }
}

/* Extra large devices */
@media screen and (min-width: 1024px) {
    .login__form-container {
        max-width: 540px;
    }
}

/* Mobile devices */
@media screen and (max-width: 575px) {
    .login {
        padding: var(--spacing-lg) var(--spacing-md);
    }
    
    .login__form-container {
        margin-inline: var(--spacing-md);
        min-height: 450px;
    }
    
    .login__form {
        padding: var(--spacing-xl) var(--spacing-lg);
        border-radius: var(--radius-xl);
    }
    
    .login__title {
        font-size: var(--h1-font-size-mobile);
        margin-bottom: var(--spacing-xl);
    }
    
    .toggle-btn {
        padding: var(--spacing-xs) var(--spacing-lg);
        font-size: 0.938rem;
    }
    
    .back-to-home {
        top: var(--spacing-md);
        left: var(--spacing-md);
        padding: var(--spacing-xs) var(--spacing-md);
        font-size: 0.875rem;
    }
    
    .back-to-home span {
        display: none;
    }
    
    .back-to-home i {
        font-size: 1.5rem;
    }
    
    .auth-toggle {
        margin-bottom: var(--spacing-xl);
    }
    
    .login__inputs {
        row-gap: var(--spacing-md);
        margin-bottom: var(--spacing-lg);
    }
    
    .login__box {
        padding: 0 var(--spacing-md);
    }
    
    .login__input {
        padding: var(--spacing-sm) 0;
        font-size: 0.938rem;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --input-border: rgba(0, 0, 0, 0.5);
        --input-border-focus: var(--primary-dark);
        --card-border: rgba(99, 102, 241, 0.4);
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}