/**
 * Responsive Breakpoint System
 * 
 * Breakpoints:
 * - Phone (Mobile):     < 768px
 * - Tablet:             768px - 1023px  
 * - Desktop (Regular):  1024px - 1439px
 * - Desktop (Large):    1440px+
 * 
 * Mobile-first approach: Base styles are for mobile,
 * then progressively enhanced for larger screens.
 */

/* ==========================================================================
   ROOT VARIABLES
   ========================================================================== */

:root {
    /* Breakpoint values */
    --breakpoint-phone: 767px;
    --breakpoint-tablet: 768px;
    --breakpoint-desktop: 1024px;
    --breakpoint-desktop-lg: 1440px;

    /* Container max-widths */
    --container-phone: 100%;
    --container-tablet: 720px;
    --container-desktop: 960px;
    --container-desktop-lg: 1200px;

    /* Spacing scale (adjusts per breakpoint) */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
}

/* ==========================================================================
   BASE (MOBILE FIRST) - Phone < 768px
   ========================================================================== */

/* Container base styles */
.container {
    width: 100%;
    max-width: var(--container-phone);
    margin-left: auto;
    margin-right: auto;
    padding: var(--spacing-sm) var(--spacing-lg);
}

.container-narrow {
    width: 100%;
    max-width: var(--container-phone);
    margin-left: auto;
    margin-right: auto;
    padding: var(--spacing-sm) var(--spacing-lg);
}

/* Remove margin from first and last children */
.container > *:first-child,
.container-narrow > *:first-child {
    margin-top: 0.5rem;
}

.container > *:last-child,
.container-narrow > *:last-child {
    margin-bottom: 0;
}

/* Responsive typography base (mobile) */
html {
    font-size: 16px;
}

h1 {
    font-size: 28px;
    line-height: 32px;
}

h2 {
    font-size: 24px;
    line-height: 28px;
}

h3 {
    font-size: 20px;
    line-height: 24px;
}

.lead {
    font-size: 1.125rem;
    line-height: 1.6;
}

/* Responsive spacing (mobile) */
.section {
    padding: 0;
}

.hero {
    padding: 0;
}

header {
    padding: 0;
}

footer {
    padding: 1.5rem var(--spacing-lg);
}

/* Grid adjustments (mobile) */
.card-grid {
    grid-template-columns: 1fr;
}

/* Navigation (mobile) */
nav ul {
    flex-direction: column;
    gap: var(--spacing-xs);
}

/* Mobile navigation - hamburger menu for mobile devices */
@media (max-width: 768px) {
    /* Show hamburger button on mobile */
    .nav-toggle {
        display: flex;
    }

    /* Hide site definition subtitle on mobile to prevent pushing hamburger off screen */
    .site-definition {
        display: none;
    }

    /* Keep navigation horizontal with hamburger on the right */
    .navigation {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
        position: relative;
    }

    /* Hide nav links by default on mobile, show as dropdown */
    .nav-links {
        display: none;
        position: absolute;
        top: calc(100% + 1rem);
        right: 0;
        flex-direction: column;
        gap: 0;
        background: rgba(252, 245, 229, 0.98);
        backdrop-filter: blur(12px);
        -webkit-backdrop-filter: blur(12px);
        border: 1px dashed #e5dcc8;
        border-radius: 8px;
        padding: 0.75rem 0;
        min-width: 200px;
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
        z-index: 99;
    }

    /* Show dropdown when open */
    .nav-links.open {
        display: flex;
    }

    /* Style links in dropdown */
    .nav-links li {
        width: 100%;
        margin: 0;
    }

    .nav-links a {
        display: block;
        padding: 0.75rem 1.5rem;
        width: 100%;
        transition: background 0.2s ease, color 0.2s ease;
    }

    .nav-links a:hover {
        background: rgba(0, 123, 255, 0.08);
    }
}

/* Tablet and up - hide hamburger, show normal nav */
@media (min-width: 769px) {
    .nav-toggle {
        display: none;
    }

    .nav-links {
        display: flex !important;
        position: static;
        flex-direction: row;
        background: transparent;
        border: none;
        border-radius: 0;
        padding: 0;
        min-width: 0;
        box-shadow: none;
    }

    .nav-links a {
        padding: 0;
    }
}

/* ==========================================================================
   TABLET - 768px to 1023px
   ========================================================================== */

@media (min-width: 768px) {
    :root {
        --spacing-xs: 0.25rem;
        --spacing-sm: 0.5rem;
        --spacing-md: 1rem;
        --spacing-lg: 2rem;
        --spacing-xl: 3rem;
        --spacing-2xl: 4rem;
        --spacing-3xl: 5rem;
    }

    /* Container */
    .container {
        max-width: var(--container-tablet);
        padding: var(--spacing-xs) var(--spacing-md);
    }

    .container-narrow {
        max-width: 640px;
        padding: var(--spacing-xs) var(--spacing-md);
    }

    /* Typography */
    html {
        font-size: 16px;
    }

    h1 {
        font-size: 32px;
        line-height: 36px;
    }

    h2 {
        font-size: 28px;
        line-height: 32px;
    }

    h3 {
        font-size: 24px;
        line-height: 28px;
    }

    .lead {
        font-size: 1.25rem;
        line-height: 1.6;
    }

    /* Spacing */
    .section {
        padding: 0;
    }

    .hero {
        padding: 0;
    }

    header {
        padding: 0;
    }

    footer {
        padding: 2rem var(--spacing-md);
    }

    /* Grid */
    .card-grid {
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    }

    /* Navigation */
    nav ul {
        flex-direction: row;
        gap: var(--spacing-xs);
    }
}

/* ==========================================================================
   DESKTOP (REGULAR) - 1024px to 1439px
   ========================================================================== */

@media (min-width: 1024px) {
    :root {
        --spacing-xs: 0.25rem;
        --spacing-sm: 0.5rem;
        --spacing-md: 1rem;
        --spacing-lg: 2rem;
        --spacing-xl: 3rem;
        --spacing-2xl: 5rem;
        --spacing-3xl: 6rem;
    }

    /* Container */
    .container {
        max-width: var(--container-desktop);
        padding: var(--spacing-sm) var(--spacing-lg);
    }

    .container-narrow {
        max-width: 720px;
        padding: var(--spacing-sm) var(--spacing-md);
    }

    /* Typography */
    html {
        font-size: 18px;
    }

    h1 {
        font-size: 36px;
        line-height: 40px;
    }

    h2 {
        font-size: 32px;
        line-height: 36px;
    }

    h3 {
        font-size: 28px;
        line-height: 32px;
    }

    .lead {
        font-size: 1.25rem;
        line-height: 1.6;
    }

    /* Spacing */
    .section {
        padding: 0;
    }

    .hero {
        padding: 0;
    }

    header {
        padding: 0;
    }

    footer {
        padding: 2rem var(--spacing-lg);
    }

    /* Grid */
    .card-grid {
        grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    }

    /* Navigation */
    nav ul {
        gap: var(--spacing-xs);
    }
}

/* ==========================================================================
   DESKTOP (LARGE) - 1440px and above
   ========================================================================== */

@media (min-width: 1440px) {
    :root {
        --spacing-xs: 0.25rem;
        --spacing-sm: 0.5rem;
        --spacing-md: 1rem;
        --spacing-lg: 2.5rem;
        --spacing-xl: 4rem;
        --spacing-2xl: 6rem;
        --spacing-3xl: 8rem;
    }

    /* Container */
    .container {
        max-width: var(--container-desktop-lg);
        padding: var(--spacing-sm) var(--spacing-md);
    }

    .container-narrow {
        max-width: 800px;
        padding: var(--spacing-sm) var(--spacing-sm);
    }

    /* Typography */
    html {
        font-size: 18px;
    }

    h1 {
        font-size: 48px;
        line-height: 52px;
    }

    h2 {
        font-size: 36px;
        line-height: 40px;
    }

    h3 {
        font-size: 28px;
        line-height: 32px;
    }

    .lead {
        font-size: 1.375rem;
        line-height: 1.6;
    }

    /* Spacing */
    .section {
        padding: 0;
    }

    .hero {
        padding: 0;
    }

    header {
        padding: 0;
    }

    footer {
        padding: 2rem var(--spacing-md);
    }

    /* Grid */
    .card-grid {
        grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    }

    /* Navigation */
    nav ul {
        gap: var(--spacing-xs);
    }
}

/* ==========================================================================
   RESPONSIVE UTILITY CLASSES
   ========================================================================== */

/* Display utilities */
.hide-phone {
    display: none;
}

.hide-tablet {
    display: initial;
}

.hide-desktop {
    display: initial;
}

.hide-desktop-lg {
    display: initial;
}

@media (min-width: 768px) {
    .hide-phone {
        display: initial;
    }

    .hide-tablet {
        display: none;
    }

    .show-phone-only {
        display: none;
    }
}

@media (min-width: 1024px) {
    .hide-tablet {
        display: initial;
    }

    .hide-desktop {
        display: none;
    }

    .show-tablet-only {
        display: none;
    }
}

@media (min-width: 1440px) {
    .hide-desktop {
        display: initial;
    }

    .hide-desktop-lg {
        display: none;
    }

    .show-desktop-only {
        display: none;
    }
}

/* Text alignment responsive utilities */
@media (max-width: 767px) {
    .text-center-phone {
        text-align: center;
    }

    .text-left-phone {
        text-align: left;
    }
}

@media (min-width: 768px) and (max-width: 1023px) {
    .text-center-tablet {
        text-align: center;
    }

    .text-left-tablet {
        text-align: left;
    }
}

@media (min-width: 1024px) {
    .text-center-desktop {
        text-align: center;
    }

    .text-left-desktop {
        text-align: left;
    }
}

/* Responsive spacing utilities */
.p-responsive {
    padding: var(--spacing-md);
}

.px-responsive {
    padding-left: var(--spacing-md);
    padding-right: var(--spacing-md);
}

.py-responsive {
    padding-top: var(--spacing-md);
    padding-bottom: var(--spacing-md);
}

.m-responsive {
    margin: var(--spacing-md);
}

.mx-responsive {
    margin-left: var(--spacing-md);
    margin-right: var(--spacing-md);
}

.my-responsive {
    margin-top: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

/* Flexible grid system */
.row {
    display: flex;
    flex-wrap: wrap;
    margin-left: calc(var(--spacing-md) * -1);
    margin-right: calc(var(--spacing-md) * -1);
}

.col {
    flex: 1;
    padding-left: var(--spacing-md);
    padding-right: var(--spacing-md);
}

/* Column breakpoints */
@media (max-width: 767px) {
    .col-phone-12 {
        flex: 0 0 100%;
        max-width: 100%;
    }

    .col-phone-6 {
        flex: 0 0 50%;
        max-width: 50%;
    }
}

@media (min-width: 768px) {
    .col-tablet-12 {
        flex: 0 0 100%;
        max-width: 100%;
    }

    .col-tablet-6 {
        flex: 0 0 50%;
        max-width: 50%;
    }

    .col-tablet-4 {
        flex: 0 0 33.333%;
        max-width: 33.333%;
    }

    .col-tablet-3 {
        flex: 0 0 25%;
        max-width: 25%;
    }
}

@media (min-width: 1024px) {
    .col-desktop-12 {
        flex: 0 0 100%;
        max-width: 100%;
    }

    .col-desktop-6 {
        flex: 0 0 50%;
        max-width: 50%;
    }

    .col-desktop-4 {
        flex: 0 0 33.333%;
        max-width: 33.333%;
    }

    .col-desktop-3 {
        flex: 0 0 25%;
        max-width: 25%;
    }
}

/* Responsive images */
.img-responsive {
    max-width: 100%;
    height: auto;
    display: block;
}

/* Container queries support (modern browsers) */
@supports (container-type: inline-size) {
    .container-query {
        container-type: inline-size;
    }
}